COLLAGEN AESTHETICS INC
S-8, 1998-12-30
ORTHOPEDIC, PROSTHETIC & SURGICAL APPLIANCES & SUPPLIES
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<PAGE>   1
   As filed with the Securities and Exchange Commission on December 30, 1998
                                                 Registration No. 333-__________
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                ----------------

                                    FORM S-8

                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                                ----------------

                            COLLAGEN AESTHETICS, INC.
             ------------------------------------------------------
             (Exact name of Registrant as specified in its charter)

<TABLE>
<CAPTION>
<S>                                      <C>       
        DELAWARE                                      94-2300486
(State of incorporation)                 (I.R.S. Employer Identification No.)
</TABLE>

                              1850 EMBARCADERO ROAD
                           PALO ALTO, CALIFORNIA 94303
                    (Address of principal executive offices)

                             -----------------------

                             1994 STOCK OPTION PLAN
                        1998 EMPLOYEE STOCK PURCHASE PLAN
                        1998 DIRECTORS' STOCK OPTION PLAN
                            (Full title of the Plans)

                             -----------------------

                               GARY S. PETERSMEYER
                 PRESIDENT, CHIEF EXECUTIVE OFFICER AND DIRECTOR
                            COLLAGEN AESTHETICS, INC.
                              1850 EMBARCADERO ROAD
                           PALO ALTO, CALIFORNIA 94303
                                 (650) 856-0200
 (Name, address and telephone number, including area code, of agent for service)

                             -----------------------

                                    Copy to:


                                 Jon E. Gavenman
                                 Brooke Campbell
                                Venture Law Group
                           A Professional Corporation
                               2800 Sand Hill Road
                          Menlo Park, California 94025
                                 (650) 854-4488



<PAGE>   2

                        CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>
                                                             Proposed               Proposed     
                                            Maximum           Maximum                Maximum          Amount of  
                                          Amount to be     Offering Price           Aggregate       Registration  
Title of Securities to be Registered      Registered(1)      Per Share           Offering Price          Fee                       
- ----------------------------------------------------------------------------------------------------------------
<S>                                       <C>              <C>                      <C>               <C> 
1994 STOCK OPTION PLAN
  Common Stock,                             70,000
  $0.001 par value ...................     Shares(2)        $8.7500(3)              $  612,500        $170.27 

1998 EMPLOYEE STOCK PURCHASE PLAN
  Common Stock,                            125,000
  $0.001 par value ...................     Shares(4)        $7.4375(5)              $  929,688        $258.45 

1998 DIRECTORS' STOCK OPTION PLAN
  Common Stock,                            250,000 
  $0.001 par value ...................     Shares(6)        $8.7500(3)              $2,187,500        $608.13 
</TABLE>

(1)     This Registration Statement shall also cover any additional shares of
        Common Stock which become issuable under any of the Plans being
        registered pursuant to this Registration Statement by reason of any
        stock dividend, stock split, recapitalization or any other similar
        transaction effected without the receipt of consideration which results
        in an increase in the number of the Registrant's outstanding shares of
        Common Stock.

(2)     This total represents a 70,000 share increase in the shares reserved for
        issuance under the Registrant's 1994 Stock Option Plan, which increase
        was approved by the Registrant's Board of Directors on April 3, 1998 and
        by the Registrant's stockholders on August 12, 1998. This total excludes
        an additional 1,150,000 shares that were registered for issuance under
        the 1994 Stock Option Plan pursuant to previous registration statements
        on Form S-8 filed by the Registrant.

(3)     Estimated in accordance with Rule 457(h) under the Securities Act solely
        for the purpose of calculating the registration fee. The computation
        with respect to unissued options is based on the average of the high and
        low prices of the Common Stock as reported on the Nasdaq National Market
        on December 28, 1998.

(4)     This total represents 125,000 shares reserved for issuance under the
        Registrant's 1998 Employee Stock Purchase Plan, which reservation was
        approved by the Registrant's Board of Directors on April 3, 1998 and by
        the Registrant's stockholders on August 12, 1998.

(5)     Estimated in accordance with Rule 457(h) under the Securities Act of
        1933 (the "Securities Act") solely for the purpose of calculating the
        registration fee. The computation is based on the average of the high
        and low prices of the Common Stock as reported on the Nasdaq National
        Market on December 28, 1998, multiplied by 85%, which is the percentage
        of the trading purchase price applicable to purchases under the
        referenced plan.

(6)     This total represents 250,000 shares reserved for issuance under the
        Registrant's 1998 Directors' Stock Option Plan, which reservation was
        approved by the Registrant's Board of Directors on April 3, 1998 and by
        the Registrant's stockholders on August 12, 1998.



<PAGE>   3

                                    PART II
               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3. INCORPORATION OF DOCUMENTS BY REFERENCE.

        The following documents filed with the Securities and Exchange
Commission (the "Commission") are hereby incorporated by reference:

        (a)    The Registrant's Annual Report on Form 10-K for the fiscal year
ended June 30, 1998 filed pursuant to Section 13 of the Securities Exchange Act
of 1934 (the "Exchange Act") (excluding those exhibits not required to be filed
on Form S-8 as governed by the Securities Act).

        (b)    The Registrant's Quarterly Report on Form 10-Q for the period
ended September 30, 1998 (excluding those exhibits not required to be filed on
Form S-8 as governed by the Securities Act). 

        (c)    The Registrant's Current Report on Form 8-K/A dated August 18, 
1998.

        (d)    The description of the Registrant's Common Stock contained in the
Registrant's Registration Statements on Form 8-A filed with the Commission under
Section 12 of the Exchange Act on August 26, 1982 and November 29, 1994,
including any amendment or report filed for the purpose of updating such
description.

        All documents subsequently filed by the Registrant pursuant to Sections
13(a), 13(c), 14 and 15(d) of the Exchange Act, prior to the filing of a
post-effective amendment which indicates that all securities offered hereby have
been sold or which deregisters all securities then remaining unsold, shall be
deemed to be incorporated by reference in this Registration Statement and to be
part hereof from the date of filing such documents.

Item 4. DESCRIPTION OF SECURITIES.  Not applicable.

Item 5. INTERESTS OF NAMED EXPERTS AND COUNSEL.  Not applicable.

Item 6. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

        Section 145(a) of the Delaware General Corporation Law (the "DGCL")
provides in relevant part that "a corporation may indemnify any person who was
or is a party or is threatened to be made a party to any threatened, pending or
complete action, suit or proceeding, whether civil, criminal, administrative or
investigative (other than an action by or in the right of the corporation), by
reason of the fact that he is or was a director, officer, employee or agent of
another corporation, partnership, joint venture, trust or other enterprise,
against expenses (including attorneys' fees), judgments, fines and amounts paid
in settlement actually and reasonably incurred by him in connection with such
action, suit or proceeding if he acted in good faith and in a manner he
reasonably believed to be in or not opposed to the best interest of the
corporation, and, with respect to any criminal action or proceeding, had no
reasonable cause to believe his conduct was unlawful." With respect to
derivative actions, Section 145(b) of the DGCL provides in relevant part that
"(a) corporation may indemnify any person who or is a party or is threatened to
be made a party to any threatened, pending or completed action or suit by or in
the right of the corporation to produce a judgment in its favor...(by reason of
his service in one of the capacities specified in the preceding sentence)
against expenses (including attorneys' fees) actually and reasonably incurred by
him in connection with the defense or settlement of such action or suit if he
acted in good faith and in a manner he reasonably believed to be in or not
opposed to the best interest of the corporation and except that no
indemnification shall be made in respect of any claim, issue or matter as to
which such person shall have been adjudged to be liable to the corporation
unless and only to the extent that the Court of Chancery or the court in which
such action or suit was brought shall determine upon application that, despite
the adjudication of liability but in view of all the circumstances of the case,
such person is fairly and reasonably entitled to indemnity for such expenses
which the Court of Chancery or such other court shall deem proper."

        The Registrant's Certificate of Incorporation provides that each person
who is or was or who has agreed to become a director or officer of the
Registrant or who had agreed at the request of the Registrant's Board of
Directors or an officer of the Registrant to serve as an employee or agent of
the Registrant or as a director, officer, employee or agent of another
corporation, partnership, joint venture, trust or other enterprise, shall be
indemnified 



                                       -3-
<PAGE>   4

by the Registrant to the full extent permitted by the DGCL or any other
applicable laws. Such Certificate of Incorporation also provides that no
amendment or repeal of such Certificate shall apply to or have any effect on the
right to indemnification permitted or authorized thereunder for or with respect
to claims asserted before or after such amendment or repeal arising from acts or
omissions occurring in whole or in part before the effective date of such
amendment or repeal.

        The Registrant's Bylaws provide that the Registrant shall indemnify to
the full extent authorized by law any person made or threatened to be made a
party to an action or a proceeding, whether criminal, civil, administrative or
investigative, by reason of the fact that he was or is a director, officer, or
employee of the Registrant or serves or served any other enterprise as a
director, officer or employee at the request of the Registrant.

        The Registrant has entered or will enter into indemnification agreements
with its directors and certain of its officers. The Registrant intends to
purchase insurance on behalf of its officers and directors against losses
arising from any claim asserted against or incurred by such individuals in any
such capacity, subject to certain exclusions.

Item 7. EXEMPTION FROM REGISTRATION CLAIMED.  Not applicable.

Item 8. EXHIBITS.

<TABLE>
<CAPTION>
      Exhibit
      Number
      -------
      <S>      <C>
      4.1(1)   Certificate of Incorporation of the Registrant.

      4.2      Certificate of Amendment of Certificate of Incorporation.

      4.3(2)   Bylaws of the Registrant. 

      4.4      1994 Stock Option Plan, as amended.

      4.5      1998 Employee Stock Purchase Plan.

      4.6      1998 Directors' Stock Option Plan.
                                                                
      5.1      Opinion of Venture Law Group, a Professional  Corporation.

     23.1      Consent of Venture Law Group, a Professional Corporation
               (included in Exhibit 5.1).

     23.2      Consent of Ernst & Young, LLP, Independent Auditors.
                           
     24.1      Power of Attorney (see pg. 7).
</TABLE>

(1) Incorporated by reference to Exhibits 3.1 and 3.2 filed with the
    Registrant's Annual Report on Form 10-K for the fiscal year ended June 30,
    1998.

(2) Incorporated by reference to Exhibits 3.3 and 3.4 filed with the
    Registrant's Annual Report on Form 10-K for the fiscal year ended June 30,
    1998.

Item 9. UNDERTAKINGS.

        The undersigned Registrant hereby undertakes:

               (1) to file, during any period in which offers or sales are being
made, a post-effective amendment to this registration statement to include any
material information with respect to the plan of distribution not previously
disclosed in the registration statement or any material change to such
information in the registration statement.

               (2) that, for purposes of determining any liability under the
Securities Act, each such post-effective amendment shall be deemed to be a new
registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

               (3) to remove from registration by means of a post-effective
amendment any of the securities being registered which remain unsold at the
termination of the offering.

        The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act, each filing of the
Registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Exchange Act that is incorporated by reference in the registration statement
shall be deemed to be a new registration statement relating to the securities
offered therein, and the offering of such securities at that time shall be
deemed to be the initial bona fide offering thereof.

        Insofar as the indemnification for liabilities arising under the
Securities Act may be permitted to directors, officers and controlling persons
of the Registrant pursuant to the foregoing provisions, or otherwise, the
Registrant

                                       -4-
<PAGE>   5

has been advised that in the opinion of the Commission such indemnification is
against public policy as expressed in the Securities Act and is, therefore,
unenforceable. In the event that a claim for indemnification against such
liabilities (other than the payment by the Registrant of expenses incurred or
paid by a director, officer or controlling person of the Registrant in a
successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered hereunder, the Registrant will, unless in the opinion of its counsel
the question has already been settled by controlling precedent, submit to a
court of appropriate jurisdiction the question of whether such indemnification
by it is against public policy as expressed in the Securities Act and will be
governed by the final adjudication of such issue.

                            [Signature Pages Follow]



                                       -5-
<PAGE>   6

                                   SIGNATURES


        Pursuant to the requirements of the Securities Act of 1933, the
Registrant, Collagen Aesthetics, Inc., a corporation organized and existing
under the laws of the State of Delaware, certifies that it has reasonable
grounds to believe that it meets all of the requirements for filing on Form S-8
and has duly caused this Registration Statement to be signed on its behalf by
the undersigned, thereunto duly authorized, in the City of Palo Alto, State of
California, on December 30, 1998.

                                        Collagen Aesthetics, Inc.


                                        By: /S/ GARY S. PETERSMEYER
                                            ------------------------------------
                                            Gary S. Petersmeyer
                                            Chief Executive Officer



                                       -6-
<PAGE>   7

                                POWER OF ATTORNEY

        KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below constitutes and appoints Gary S. Petersmeyer and Bob Newell,
jointly and severally, his or her attorneys-in-fact and agents, each with the
power of substitution and resubstitution, for him or her and in his or her name,
place or stead, in any and all capacities, to sign any amendments to this
Registration Statement on Form S-8, and to file such amendments, together with
exhibits and other documents in connection therewith, with the Securities and
Exchange Commission, granting to each attorney-in-fact and agent, full power and
authority to do and perform each and every act and thing requisite and necessary
to be done in and about the premises, as fully as he or she might or could do in
person, and ratifying and confirming all that the attorneys-in-fact and agents,
or his or her substitute or substitutes, may do or cause to be done by virtue
hereof.

        Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities and on the dates indicated.

<TABLE>
<CAPTION>
       Signature                                Title                                  Date
       ---------                                -----                                  ----
<S>                                <C>                                          <C>
/s/ GARY S. PETERSMEYER            President, Chief Executive Officer and       December 30, 1998
- ----------------------------       Director (Principal Executive Officer)
Gary S. Petersmeyer 

/s/ BOB NEWELL                     Chief Financial Officer (Principal           December 22, 1998
- ----------------------------       Financial and Accounting Officer)
Bob Newell                          

/s/ ANNE L. BAKAR                  Director                                     December 30, 1998
- ----------------------------
Anne L. Bakar

/s/ GERALD LAZARUS                 Director                                     December 21, 1998
- ----------------------------
Gerald Lazarus, M.D.

/s/ FULTON COLLINS                 Director                                     December 21, 1998
- ----------------------------
Fulton Collins

                                   Director 
- ----------------------------
William G. Davis
</TABLE>



                                       -7-
<PAGE>   8

                                INDEX TO EXHIBITS


<TABLE>
<CAPTION>
 Exhibit                                                                
 Number                                                                 
 -------                                                                
<S>         <C>                                 
   4.1(1)   Certificate of Incorporation of the Registrant.

   4.2      Certificate of Amendment of Certificate of Incorporation.

   4.3(2)   Bylaws of the Registrant. 

   4.4      1994 Stock Option Plan, as amended.

   4.5      1998 Employee Stock Purchase Plan.

   4.6      1998 Directors' Stock Option Plan.
                                                                
   5.1      Opinion of Venture Law Group, A Professional Corporation.   

   23.1     Consent of Venture Law Group, A Professional Corporation.
            (included in Exhibit 5.1).

   23.2     Consent of Ernst & Young, LLP, Independent Auditors.

   24.1     Power of Attorney (see p. 7).                                                
</TABLE>

(1) Incorporated by reference to Exhibits 3.1 and 3.2 filed with the
    Registrant's Annual Report on Form 10-K for the fiscal year ended June 30,
    1998.

(2) Incorporated by reference to Exhibits 3.3 and 3.4 filed with the
    Registrant's Annual Report on Form 10-K for the fiscal year ended June 30,
    1998.



                                       -8-

<PAGE>   1
                                                                     EXHIBIT 4.2


                           CERTIFICATE OF AMENDMENT OF

                          CERTIFICATE OF INCORPORATION

                                       OF

                              COLLAGEN CORPORATION


        The undersigned hereby certifies that:

        1. He is the duly elected and acting President and Chief Executive
Officer of Collagen Corporation, a Delaware corporation.

        2. The Certificate of Incorporation of this corporation was originally
filed with the Secretary of State of Delaware on October 10, 1986.

        3. Pursuant to Section 242 of the General Corporation Law of the State
of Delaware, this Certificate of Amendment of Certificate of Incorporation
amends Article I of this corporation's Certificate of Incorporation to read in
its entirety as follows:

               "The name of this corporation is Collagen Aesthetics, Inc."

        4. The foregoing Certificate of Amendment has been duly adopted by this
corporation's Board of Directors and stockholders in accordance with the
applicable provisions of the General Corporation Law of the State of Delaware.

        Executed at Palo Alto, California, August 13, 1998.

                                    /s/  GARY PETERSMEYER
                                    --------------------------------------------
                                    Gary S. Petersmeyer,
                                    President and Chief Executive Officer

<PAGE>   1
                                                                     EXHIBIT 4.4


                            COLLAGEN AESTHETICS, INC.

                             1994 STOCK OPTION PLAN
                          (AS AMENDED AUGUST 12, 1998)

        1. Purposes of the Plan. The purposes of this Stock Option Plan are to
attract and retain the best available personnel for positions of substantial
responsibility, to provide additional incentive to the Employees and Consultants
of the Company and to promote the success of the Company's business.

               Options granted hereunder may be either Incentive Stock Options
(as defined under Section 422 of the Code) or Nonstatutory Stock Options, at the
discretion of the Board and as reflected in the terms of the written option
agreement. Stock purchase rights may also be granted under the Plan.

        2. Definitions. As used herein, the following definitions shall apply:

               (a) "Administrator" shall mean the Board or any of its Committees
appointed pursuant to Section 4 of the Plan.

               (b) "Applicable Laws" shall have the meaning set forth in Section
4(a) below.

               (c) "Board" shall mean the Board of Directors of the Company.

               (d) "Code" shall mean the Internal Revenue Code of 1986, as
amended.

               (e) "Committee" shall mean the Committee appointed by the Board
of Directors in accordance with paragraph (a) of Section 4 of the Plan, if one
is appointed.

               (f) "Common Stock" shall mean the Common Stock of the Company.

               (g) "Company" shall mean Collagen Aesthetics, Inc., a Delaware
corporation.

               (h) "Consultant" shall mean any person who is engaged by the
Company or any Parent or Subsidiary to render consulting services and is
compensated for such consulting services, and any director of the Company
whether compensated for such services or not; provided that the term Consultant
shall not include directors who are not compensated for their services or are
paid only a director's fee by the Company.


                                      -1-
<PAGE>   2

               (i) "Continuous Status as an Employee or Consultant" shall mean
the absence of any interruption or termination of service as an Employee or
Consultant. Continuous Status as an Employee or Consultant shall not be
considered interrupted in the case of sick leave, military leave, or any other
leave of absence approved by the Administrator; provided that such leave is for
a period of not more than 90 days or reemployment upon the expiration of such
leave is guaranteed by contract or statute. For purposes of this Plan, a change
in status from an Employee to a Consultant or from a Consultant to an Employee
will not constitute a termination of employment.

               (j) "Director" shall mean a member of the Board.

               (k) "Employee" shall mean any person, including Named Executives,
Officers and Directors, employed by the Company or any Parent or Subsidiary of
the Company. The payment of a director's fee by the Company shall not be
sufficient to constitute "employment" by the Company.

               (l) "Exchange Act" shall mean the Securities Exchange Act of
1934, as amended.

               (m) "Fair Market Value" shall mean, as of any date, the value of
Common Stock determined as follows:

                      (i) If the Common Stock is listed on any established stock
exchange or a national market system including without limitation the National
Market System of the National Association of Securities Dealers, Inc. Automated
Quotation ("NASDAQ") System, its Fair Market Value shall be the closing sales
price for such stock as quoted on such system on the date of determination (if
for a given day no sales were reported, the closing sales price for the last
trading day immediately preceding the date of determination shall be used), as
such price is reported in The Wall Street Journal or such other source as the
Administrator deems reliable;

                      (ii) If the Common Stock is quoted on the NASDAQ System
(but not on the National Market System thereof) or regularly quoted by a
recognized securities dealer but selling prices are not reported, its Fair
Market Value shall be the mean between the bid and asked prices for the Common
Stock or;

                      (iii) In the absence of an established market for the
Common Stock, the Fair Market Value thereof shall be determined in good faith by
the Administrator.

               (n) "Incentive Stock Option" shall mean an Option intended to
qualify as an incentive stock option within the meaning of Section 422 of the
Code.

               (o) "Named Executive" shall mean any individual who, on the last
day of the Company's fiscal year, is the chief executive officer of the Company
(or is acting in that capacity) or among the four highest compensated officers
of the Company (other than the chief executive officer). Such officer status
shall be determined pursuant to the executive compensation disclosure rules
under the Exchange Act.


                                      -2-
<PAGE>   3

               (p) "Nonstatutory Stock Option" shall mean an Option not intended
to qualify as an Incentive Stock Option.

               (q) "Officer" shall mean a person who is an officer of the
Company within the meaning of Section 16 of the Exchange Act and the rules and
regulations promulgated thereunder.

               (r) "Option" shall mean a stock option granted pursuant to the
Plan.

               (s) "Optioned Stock" shall mean the Common Stock subject to an
Option or a Stock Purchase Right.

               (t) "Optionee" shall mean an Employee or Consultant who receives
an Option.

               (u) "Parent" shall mean a "parent corporation," whether now or
hereafter existing, as defined in Section 424(e) of the Code.

               (v) "Plan" shall mean this 1994 Stock Option Plan.

               (w) "Restricted Stock" shall mean shares of Common Stock acquired
pursuant to a grant of a Stock Purchase Right under Section 11 below.

               (x) "Rule 16b-3" shall mean Rule 16b-3 promulgated under the
Exchange Act as the same may be amended from time to time, or any successor
provision.

               (y) "Share" shall mean a share of the Common Stock, as adjusted
in accordance with Section 15 of the Plan.

               (z) "Stock Purchase Right" shall mean the right to purchase
Common Stock pursuant to Section 11 below.

               (aa) "Subsidiary" shall mean a "subsidiary corporation," whether
now or hereafter existing, as defined in Section 424(f) of the Code.

        3. Stock Subject to the Plan. Subject to the provisions of Section 15 of
the Plan, the maximum aggregate number of shares that may be optioned and sold
under the Plan is 1,220,000 shares of Common Stock. The Shares may be
authorized, but unissued, or reacquired Common Stock.

        If an Option or Stock Purchase Right should expire or become
unexercisable for any reason without having been exercised in full, the
unpurchased Shares that were subject thereto shall, unless the Plan shall have
been terminated, become available for future grant under the Plan.
Notwithstanding any other provision of the Plan, shares issued under the Plan
and later repurchased by the Company shall not become available for future grant
or sale under the Plan.


                                      -3-
<PAGE>   4

        4. Administration of the Plan.

               (a) Composition of Administrator.

                      (i) Multiple Administrative Bodies. If permitted by Rule
16b-3 and by the legal requirements relating to the administration of incentive
stock option plans, if any, of applicable securities laws and the Code
(collectively, the "Applicable Laws"), the Plan may (but need not) be
administered by different administrative bodies with respect to directors,
officers who are not directors and Employees who are neither directors nor
officers.

                      (ii) Administration with respect to Directors and
Officers. With respect to grants of Options or Stock Purchase Rights to
Employees or Consultants who are also officers or directors of the Company, the
Plan shall be administered by (A) the Board, if the Board may make grants under
the Plan in compliance with Rule 16b-3 and Section 162(m) of the Code as it
applies so as to qualify grants of Options to Named Executives as
performance-based compensation, or (B) a Committee designated by the Board to
make grants under the Plan, which Committee shall be constituted in such a
manner so as to make grants under the Plan in compliance with Rule 16b-3 and
Section 162(m) of the Code as it applies so as to qualify grants to Named
Executives as performance-based compensation and in such a manner as to satisfy
the Applicable Laws.

                      (iii) Administration with respect to Other Persons. With
respect to grants of Options or Stock Purchase Rights to Employees or
Consultants who are neither directors nor officers of the Company, the Plan
shall be administered by (A) the Board or (B) a Committee designated by the
Board, which Committee shall be constituted in such a manner as to satisfy the
Applicable Laws.

                      (iv) General. Once a Committee has been appointed pursuant
to subsection (ii) or (iii) of this Section 4(a), such Committee shall continue
to serve in its designated capacity until otherwise directed by the Board. From
time to time the Board may increase the size of any Committee and appoint
additional members thereof, remove members (with or without cause) and appoint
new members in substitution therefor, fill vacancies (however caused) and remove
all members of a Committee and thereafter directly administer the Plan, all to
the extent permitted by the Applicable Laws and, in the case of a Committee
appointed under subsection (ii), to the extent permitted by Rule 16b-3 as it
applies to a plan intended to qualify thereunder as a discretionary plan, and to
the extent required under Section 162(m) of the Code to qualify grants of
Options to Named Executives as performance-based compensation.

               (b) Powers of the Administrator. Subject to the provisions of the
Plan and in the case of a Committee, the specific duties delegated by the Board
to such Committee, the Administrator shall have the authority, in its
discretion:


                                      -4-
<PAGE>   5
                      (i) to determine the Fair Market Value of the Common
Stock, in accordance with Section 2(m) of the Plan;

                      (ii) to select the Employees and Consultants to whom
Options and Stock Purchase Rights may from time to time be granted hereunder;

                      (iii) to determine whether and to what extent Options and
Stock Purchase Rights or any combination thereof are granted hereunder;

                      (iv) to determine the number of shares of Common Stock to
be covered by each such award granted hereunder;

                      (v) to approve forms of agreement for use under the Plan;

                      (vi) to determine the terms and conditions, not
inconsistent with the terms of the Plan, of any award granted hereunder
(including, but not limited to, the share price and any restriction or
limitation, or any vesting acceleration or waiver of forfeiture restrictions
regarding any Option or Stock Purchase Right and/or the shares of Common Stock
relating thereto, based in each case on such factors as the Administrator shall
determine, in its sole discretion);

                      (vii) to determine whether, to what extent and under what
circumstances Common Stock and other amounts payable with respect to an award
under this Plan shall be deferred either automatically or at the election of the
participant (including providing for and determining the amount, if any, of any
deemed earnings on any deferred amount during any deferral period);

                      (viii) to reduce the exercise price of any Option to the
then current Fair Market Value if the Fair Market Value of the Common Stock
covered by such Option shall have declined since the date the Option was
granted; and

                      (ix) to determine the terms and restrictions applicable to
Stock Purchase Rights and the Restricted Stock purchased by exercising such
Stock Purchase Rights.

               (c) Effect of Administrator's Decision. All decisions,
determinations and interpretations of the Administrator shall be final and
binding on all holders of Options or Stock Purchase Rights.

        5. Eligibility.

               (a) Nonstatutory Stock Options and Stock Purchase Rights may be
granted to Employees and Consultants. Incentive Stock Options may be granted
only to Employees. An Employee or Consultant who has been granted an Option or
Stock Purchase Right may, if he or she is otherwise eligible, be granted
additional Options or Stock Purchase Rights.


                                      -5-
<PAGE>   6
               (b) Each Option shall be designated in the written option
agreement as either an Incentive Stock Option or a Nonstatutory Stock Option.
However, notwithstanding such designations, to the extent that the aggregate
Fair Market Value of Stock Options are exercisable for the first time by an
Optionee during any calendar year (under all plans of the Company or any Parent
or Subsidiary) exceeds $100,000, such excess Options shall be treated as
Nonstatutory Stock Options.

               (c) For purposes of Section 5(b), Incentive Stock Options shall
be taken into account in the order in which they were granted, and the Fair
Market Value of the Shares shall be determined as of the time the Option with
respect to such Shares is granted.

               (d) The Plan shall not confer upon any Optionee any right with
respect to continuation of employment or consulting relationship with the
Company, nor shall it interfere in any way with his or her right or the
Company's right to terminate his or her employment or consulting relationship at
any time, with or without cause.

        6. Term of Plan. The Plan shall become effective upon the earlier to
occur of its adoption by the Board or its approval by the shareholders of the
Company as described in Section 21 of the Plan. It shall continue in effect for
a term of ten (10) years unless sooner terminated under Section 17 of the Plan.

        7. Term of Option. The term of each Option shall be the term stated in
the Option Agreement; provided, however, that in the case of an Incentive Stock
Option, the term shall be no more than ten (10) years from the date of grant
thereof or such shorter term as may be provided in the Option Agreement.
However, in the case of an Option granted to an Optionee who, at the time the
Option is granted, owns stock representing more than ten percent (10%) of the
voting power of all classes of stock of the Company or any Parent or Subsidiary,
the term of the Option shall be five (5) years from the date of grant thereof or
such shorter term as may be provided in the Option Agreement.

        8. Limitation on Grants to Employees. Subject to adjustment as provided
in this Plan, the maximum number of Shares which may be granted under options to
any Employee under this Plan for any fiscal year of the Company shall be
150,000.

        9.     Option Exercise Price and Consideration.

               (a) The per Share exercise price for the Shares to be issued
pursuant to exercise of an Option shall be such price as is determined by the
Administrator, but shall be subject to the following:

                      (i) In the case of an Incentive Stock Option

                             (A) granted to an Employee who, at the time of the
grant of such Incentive Stock Option, owns stock representing more than ten
percent (10%) of the voting


                                      -6-
<PAGE>   7

power of all classes of stock of the Company or any Parent or Subsidiary, the
per Share exercise price shall be no less than 110% of the Fair Market Value per
Share on the date of grant;

                             (B) granted to any other Employee, the per Share
exercise price shall be no less than 100% of the Fair Market Value per Share on
the date of grant.

                      (ii) In the case of a Nonstatutory Stock Option

                             (A) granted to a person who, at the time of the
grant of such Option, owns stock representing more than ten percent (10%) of the
voting power of all classes of stock of the Company or any Parent or Subsidiary,
the per Share exercise price shall be no less than 110% of the Fair Market Value
per Share on the date of the grant;

                             (B) granted to a person who, at the time of the
grant of such Option, is a Named Executive of the Company, the per share
Exercise Price shall be no less than 100% of the Fair Market Value on the date
of grant;

                             (C) granted to any person other than a Named
Executive, the per Share exercise price shall be no less than 85% of the Fair
Market Value per Share on the date of grant.

               (b) The consideration to be paid for the Shares to be issued upon
exercise of an Option, including the method of payment, shall be determined by
the Administrator (and, in the case of an Incentive Stock Option, shall be
determined at the time of grant) and may consist entirely of (1) cash, (2)
check, (3) promissory note, (4) other Shares that (x) in the case of Shares
acquired upon exercise of an Option either have been owned by the Optionee for
more than six months on the date of surrender or were not acquired, directly or
indirectly, from the Company, and (y) have a Fair Market Value on the date of
surrender equal to the aggregate exercise price of the Shares as to which said
Option shall be exercised, (5) authorization from the Company to retain from the
total number of Shares as to which the Option is exercised that number of Shares
having a Fair Market Value on the date of exercise equal to the exercise price
for the total number of Shares as to which the Option is exercised, (6) delivery
of a properly executed exercise notice together with irrevocable instructions to
a broker to deliver promptly to the Company the amount of sale or loan proceeds
required to pay the exercise price, (7) delivery of an irrevocable subscription
agreement for the Shares that irrevocably obligates the option holder to take
and pay for the Shares not more than twelve months after the date of delivery of
the subscription agreement, (8) any combination of the foregoing methods of
payment, or (9) such other consideration and method of payment for the issuance
of Shares to the extent permitted under Applicable Laws. In making its
determination as to the type of consideration to accept, the Administrator shall
consider if acceptance of such consideration may be reasonably expected to
benefit the Company.

        10. Exercise of Option.


                                      -7-
<PAGE>   8
               (a) Procedure for Exercise; Rights as a Shareholder. Any Option
granted hereunder shall be exercisable at such times and under such conditions
as determined by the Administrator, including performance criteria with respect
to the Company and/or the Optionee, and as shall be permissible under the terms
of the Plan.

               An Option may not be exercised for a fraction of a Share.

               An Option shall be deemed to be exercised when written notice of
such exercise has been given to the Company in accordance with the terms of the
Option by the person entitled to exercise the Option and full payment for the
Shares with respect to which the Option is exercised has been received by the
Company. Full payment may, as authorized by the Administrator, consist of any
consideration and method of payment allowable under Section 9(b) of the Plan.
Until the issuance (as evidenced by the appropriate entry on the books of the
Company or of a duly authorized transfer agent of the Company) of the stock
certificate evidencing such Shares, no right to vote or receive dividends or any
other rights as a shareholder shall exist with respect to the Optioned Stock,
notwithstanding the exercise of the Option. The Company shall issue (or cause to
be issued) such stock certificate promptly upon exercise of the Option. No
adjustment will be made for a dividend or other right for which the record date
is prior to the date the stock certificate is issued, except as provided in
Section 15 of the Plan.

               Exercise of an Option in any manner shall result in a decrease in
the number of Shares which thereafter may be available, both for purposes of the
Plan and for sale under the Option, by the number of Shares as to which the
Option is exercised.

               (b) Termination of Status as an Employee or Consultant. In the
event of termination of an Optionee's Continuous Status as an Employee or
Consultant, such Optionee may, but only within three (3) months (or such other
period of time not exceeding six (6) months in the case of a Nonstatutory Stock
Option, as is determined by the Administrator, with such determination in the
case of an Incentive Stock Option being made at the time of grant of the Option)
after the date of such termination (but in no event later than the date of
expiration of the term of such Option as set forth in the Option Agreement),
exercise his or her Option to the extent that he or she was entitled to exercise
it at the date of such termination. To the extent that the Optionee was not
entitled to exercise the Option at the date of such termination, or if the
optionee does not exercise such Option (which he or she was entitled to
exercise) within the time specified herein, the Option shall terminate.

               (c) Disability of Optionee. Notwithstanding the provisions of
Section 10(b) above, in the event of termination of an Optionee's Continuous
Status as an Employee or Consultant as a result of his or her total and
permanent disability (as defined in Section 22(e)(3) of the Code), he or she
may, but only within six (6) months (or such other period of time not exceeding
twelve (12) months as is determined by the Administrator, with such
determination in the case of an Incentive Stock Option being made at the time of
grant of the Option) from the date of such termination (but in no event later
than the date of expiration of the term of such Option as set forth in the
Option Agreement), exercise his or her Option to the extent he or she was
entitled to exercise it at the date of such termination. To the extent that he
or she was not


                                      -8-
<PAGE>   9
entitled to exercise the Option at the date of termination, or if he or she does
not exercise such Option (which he or she was entitled to exercise) within the
time specified herein, the Option shall terminate.

               (d) Death of Optionee. In the event of the death of an Optionee:

                      (i) during the term of the Option who is at the time of
his or her death an Employee or Consultant of the Company and who shall have
been in Continuous Status as an Employee or Consultant since the date of grant
of the Option, the Option may be exercised, at any time within six (6) months
(or such other period of time, not exceeding twelve (12) months, as is
determined by the Administrator, with such determination in the case of an
Incentive Stock Option being made at the time of grant of the Option) following
the date of death (but in no event later than the date of expiration of the term
of such Option as set forth in the Option Agreement), by the Optionee's estate
or by a person who acquired the right to exercise the Option by bequest or
inheritance, but only to the extent of the right to exercise that had accrued at
the date of termination; or

                      (ii) within three (3) months (or such other period of time
not exceeding three (3) months as is determined by the Administrator, with such
determination in the case of an Incentive Stock Option being made at the time of
grant of the Option) after the termination of Continuous Status as an Employee
or Consultant, the Option may be exercised, at any time within six (6) months
following the date of death (but in no event later than the date of expiration
of the term of such Option as set forth in the Option Agreement), by the
Optionee's estate or by a person who acquired the right to exercise the Option
by bequest or inheritance, but only to the extent of the right to exercise that
had accrued at the date of termination.

               (e) Rule 16b-3. Options granted to persons subject to Section
16(b) of the Exchange Act must comply with Rule 16b-3 and shall contain such
additional conditions or restrictions as may be required thereunder to qualify
for the maximum exemption from Section 16 of the Exchange Act with respect to
Plan transactions.

        11. Stock Purchase Rights.

               (a) Rights to Purchase. Stock Purchase Rights may be issued
either alone, in addition to, or in tandem with other awards granted under the
Plan and/or cash awards made outside of the Plan. After the Administrator
determines that it will offer Stock Purchase Rights under the Plan, it shall
advise the offeree in writing of the terms, conditions and restrictions related
to the offer, including the number of Shares that such person shall be entitled
to purchase, the price to be paid (which price shall not be less than 85% of the
Fair Market Value of the Shares as of the date of the offer), and the time
within which such person must accept such offer, which shall in no event exceed
thirty (30) days from the date upon which the Administrator made the
determination to grant the Stock Purchase Right. The offer shall be accepted by
execution of a Restricted Stock Purchase Agreement in the form determined by the
Administrator. Shares purchased pursuant to the grant of a Stock Purchase Right
shall be referred to herein as "Restricted Stock."


                                      -9-
<PAGE>   10

               (b) Repurchase Option. Unless the Administrator determines
otherwise, the Restricted Stock Purchase Agreement shall grant the Company a
repurchase option exercisable upon the voluntary or involuntary termination of
the purchaser's employment with the Company for any reason (including death or
disability). The purchase price for Shares repurchased pursuant to the
Restricted Stock Purchase Agreement shall be the higher of either the original
purchase price or the Fair Market Value on the date of the repurchase.

               (c) Other Provisions. The Restricted Stock Purchase Agreement
shall contain such other terms, provisions and conditions not inconsistent with
the Plan as may be determined by the Administrator in its sole discretion. In
addition, the provisions of Restricted Stock Purchase Agreements need not be the
same with respect to each purchaser.

               (d) Rights as a Shareholder. Once the Stock Purchase Right is
exercised, the purchaser shall have the rights equivalent to those of a
shareholder, and shall be a shareholder when his or her purchase is entered upon
the records of the duly authorized transfer agent of the Company. No adjustment
will be made for a dividend or other right for which the record date is prior to
the date the Stock Purchase Right is exercised, except as provided in Section 15
of the Plan.

        12. Withholding Taxes. As a condition to the exercise of Options and
Stock Purchase Rights granted hereunder, the Optionee shall make such
arrangements as the Administrator may require for the satisfaction of any
federal, state, local or foreign withholding tax obligations that may arise in
connection with the exercise, receipt or vesting of such Option. The Company
shall not be required to issue any Shares under the Plan until such obligations
are satisfied.

        13. Stock Withholding to Satisfy Withholding Tax Obligations. At the
discretion of the Administrator, Optionees may satisfy withholding obligations
as provided in this paragraph. When an Optionee incurs tax liability in
connection with an Option which tax liability is subject to tax withholding
under applicable tax laws, and the Optionee is obligated to pay the Company an
amount required to be withheld under applicable tax laws, the Optionee may
satisfy the withholding tax obligation by one or some combination of the
following methods: (a) by cash payment, (b) out of Optionee's current
compensation, (c) if permitted by the Administrator, in its discretion, by
surrendering to the Company Shares that (i) in the case of Shares previously
acquired from the Company, have been owned by the Optionee for more than six
months on the date of surrender, and (ii) have a fair market value on the date
of surrender equal to or less than the applicable taxes on the ordinary income
recognized, or (d) by electing to have the Company withhold from the Shares to
be issued upon exercise of the Option that number of Shares having a fair market
value equal to the amount required to be withheld. For this purpose, the fair
market value of the Shares to be withheld shall be determined on the date that
the amount of tax to be withheld is to be determined (the "Tax Date").

                      Any surrender by an Officer or Director of previously
owned Shares to satisfy tax withholding obligations arising upon exercise of
this Option must comply with the applicable provisions of Rule 16b-3 and shall
be subject to such additional conditions or


                                      -10-
<PAGE>   11
restrictions as may be required thereunder to qualify for the maximum exemption
from Section 16 of the Exchange Act with respect to Plan transactions.

                      All elections by an Optionee to have Shares withheld to
satisfy tax withholding obligations shall be made in writing in a form
acceptable to the Administrator and shall be subject to the following
restrictions:

               (a) the election must be made on or prior to the applicable Tax
Date;

               (b) once made, the election shall be irrevocable as to the
particular Shares of the Option as to which the election is made;

               (c) all elections shall be subject to the consent or disapproval
of the Administrator;

               (d) if the Optionee is an Officer or Director, the election must
comply with the applicable provisions of Rule 16b-3 and shall be subject to such
additional conditions or restrictions as may be required thereunder to qualify
for the maximum exemption from Section 16 of the Exchange Act with respect to
Plan transactions.

                      In the event the election to have Shares withheld is made
by an Optionee and the Tax Date is deferred under Section 83 of the Code because
no election is filed under Section 83(b) of the Code, the Optionee shall receive
the full number of Shares with respect to which the Option is exercised but such
Optionee shall be unconditionally obligated to tender back to the Company the
proper number of Shares on the Tax Date.

        14. Non-Transferability of Options, Stock Purchase Rights and Restricted
Stock. Options, Stock Purchase Rights and Restricted Stock may not be sold,
pledged, assigned, hypothecated, transferred, or disposed of in any manner other
than by will or by the laws of descent or distribution. The designation of a
beneficiary by an Optionee, Stock Purchase Rights Holder or Restricted Stock
Purchaser will not constitute a transfer. An Option or Stock Purchase Right may
be exercised, during the lifetime of the Optionee, Stock Purchase Rights Holder
or Restricted Stock Purchaser, only by the Optionee, Stock Purchase Rights
Holder or Restricted Stock Purchaser or a transferee permitted by this Section
14.

        15. Adjustments Upon Changes in Capitalization or Merger. Subject to any
required action by the shareholders of the Company, the number of shares of
Common Stock covered by each outstanding Option or Stock Purchase Right, the
number of shares of Common Stock that have been authorized for issuance under
the Plan but as to which no Options or Stock Purchase Right have yet been
granted or which have been returned to the Plan upon cancellation or expiration
of an Option or Stock Purchase Right, the maximum number of shares of Common
Stock for which Options may be granted to any Employee under Section 8 of the
Plan and the price per share of Common Stock covered by each such outstanding
Option or Stock Purchase Right, shall be proportionately adjusted for any
increase or decrease in the number of issued shares of Common Stock resulting
from a stock split, reverse stock split, stock dividend,


                                      -11-
<PAGE>   12
combination or reclassification of the Common Stock, or any other increase or
decrease in the number of issued shares of Common Stock effected without receipt
of consideration by the Company; provided, however, that conversion of any
convertible securities of the Company shall not be deemed to have been "effected
without receipt of consideration." Such adjustment shall be made by the
Administrator, whose determination in that respect shall be final, binding and
conclusive. Except as expressly provided herein, no issuance by the Company of
shares of stock of any class, or securities convertible into shares of stock of
any class, shall affect, and no adjustment by reason thereof shall be made with
respect to, the number or price of shares of Common Stock subject to an Option
or Stock Purchase Right.

        In the event of the proposed dissolution or liquidation of the Company,
the Option or Stock Purchase Right will terminate immediately prior to the
consummation of such proposed action, unless otherwise provided by the
Administrator. The Administrator may, in the exercise of its sole discretion in
such instances, declare that any Option or Stock Purchase Right shall terminate
as of a date fixed by the Administrator and give each Optionee or Stock Purchase
Right holder the right to exercise his or her Option or Stock Purchase Right as
to all or any part of the Optioned Stock or Restricted Stock, including Shares
as to which the Option or Stock Purchase Right would not otherwise be
exercisable. In the event of a proposed sale of all or substantially all of the
assets of the Company, or the merger of the Company with or into another
corporation, the Option or Stock Purchase Right shall be assumed or an
equivalent option shall be substituted by such successor corporation or a parent
or subsidiary of such successor corporation, unless the Administrator
determines, in the exercise of its sole discretion and in lieu of such
assumption or substitution, that the Optionee or Stock Purchase Right holder
shall have the right to exercise the Option or Stock Purchase Right as to some
or all of the Optioned Stock or Restricted Stock, including Shares as to which
the Option or Stock Purchase Right would not otherwise be exercisable, or that
Restricted Stock held by a purchaser shall be released from the Company's
repurchase option. If the Administrator makes an Option or Stock Purchase Right
exercisable in lieu of assumption or substitution in the event of a merger or
sale of assets, the Administrator shall notify the Optionee or Stock Purchase
Right holder that the Option or Stock Purchase Right shall be exercisable for a
period of thirty (30) days from the date of such notice, and the Option or Stock
Purchase Right will terminate upon the expiration of such period.

        16. Time of Granting Options and Stock Purchase Rights. The date of
grant of an Option or Stock Purchase Right shall, for all purposes, be the date
on which the Administrator makes the determination granting such Option or Stock
Purchase Right or such other date as is determined by the Administrator. Notice
of the determination shall be given to each Employee or Consultant to whom an
Option or Stock Purchase Right is so granted within a reasonable time after the
date of such grant.

        17. Amendment and Termination of the Plan.

               (a) Amendment and Termination. The Board may amend or terminate
the Plan from time to time in such respects as the Board may deem advisable;
provided that, the following revisions or amendments shall require approval of
the shareholders of the Company in the manner described in Section 21 of the
Plan:


                                      -12-
<PAGE>   13

                      (i) any increase in the number of Shares subject to the
               Plan, other than in connection with an adjustment under Section
               15 of the Plan;

                      (ii) any change in the designation of the class of persons
               eligible to be granted Options or Stock Purchase Rights;

                      (iii) any change in the limitation on grants to Employees
               as described in Section 8 of the Plan or other changes which
               would require shareholder approval to qualify options granted
               hereunder as performance-based compensation under Section 162(m)
               of the Code; or

                      (iv) if the Company has a class of equity securities
               registered under Section 12 of the Exchange Act at the time of
               such revision or amendment, any material increase in the benefits
               accruing to participants under the Plan.

               (b) Shareholder Approval. If any amendment requiring shareholder
approval under Section 17(a) of the Plan is made subsequent to the first
registration of any class of equity securities by the Company under Section 12
of the Exchange Act, such shareholder approval shall be solicited as described
in Section 21 of the Plan.

               (c) Effect of Amendment or Termination. Any such amendment or
termination of the Plan shall not affect Options or Stock Purchase Rights
already granted and such Options or Stock Purchase Rights shall remain in full
force and effect as if this Plan had not been amended or terminated, unless
mutually agreed otherwise between the Optionee or Stock Purchase Right Holder
and the Board, which agreement must be in writing and signed by the Optionee or
Stock Purchase Right Holder and the Company.

        18. Conditions Upon Issuance of Shares. Shares shall not be issued
pursuant to the exercise of an Option or Stock Purchase Right unless the
exercise of such Option or Stock Purchase Right and the issuance and delivery of
such Shares pursuant thereto shall comply with all relevant provisions of law,
including, without limitation, the Securities Act of 1933, as amended, the
Exchange Act, the rules and regulations promulgated thereunder, and the
requirements of any stock exchange upon which the Shares may then be listed, and
shall be further subject to the approval of counsel for the Company with respect
to such compliance.

               As a condition to the exercise of an Option or Stock Purchase
Right, the Company may require the person exercising such Option or Stock
Purchase Right to represent and warrant at the time of any such exercise that
the Shares are being purchased only for investment and without any present
intention to sell or distribute such Shares if, in the opinion of counsel for
the Company, such a representation is required by any of the aforementioned
relevant provisions of law.


                                      -13-
<PAGE>   14

        19. Reservation of Shares. The Company, during the term of this Plan,
will at all times reserve and keep available such number of Shares as shall be
sufficient to satisfy the requirements of the Plan.

               The inability of the Company to obtain authority from any
regulatory body having jurisdiction, which authority is deemed by the Company's
counsel to be necessary to the lawful issuance and sale of any Shares hereunder,
shall relieve the Company of any liability in respect of the failure to issue or
sell such Shares as to which such requisite authority shall not have been
obtained.

        20. Agreements. Options and Stock Purchase Rights shall be evidenced by
written option agreements in such form as the Board shall approve from time to
time.

        21. Shareholder Approval.

               (a) Continuance of the Plan shall be subject to approval by the
shareholders of the Company within twelve (12) months before or after the date
the Plan is adopted.

               (b) If such shareholder approval is obtained at a duly held
shareholders' meeting, it must be obtained by the affirmative vote of the
holders of a majority of the outstanding shares of the Company, or if such
shareholder approval is obtained by written consent, it must be obtained by the
unanimous written consent of all shareholders of the Company; provided, however,
that approval at a meeting or by written consent may be obtained by a lesser
degree of shareholder approval if the Board determines, in its discretion after
consultation with the Company's legal counsel, that such a lesser degree of
shareholder approval will comply with all applicable laws and will not adversely
affect the qualification of the Plan under Section 422 of the Code.

               (c) In the event that the Company registers any class of equity
securities pursuant to Section 12 of the Exchange Act, any required approval of
the shareholders of the Company obtained after such registration shall be
solicited substantially in accordance with Section 14(a) of the Exchange Act and
the rules and regulations promulgated thereunder.

               (d) If any required approval by the shareholders of the Plan
itself or of any amendment thereto is solicited at any time otherwise than in
the manner described in Section 21(c) hereof, then the Company shall, at or
prior to the first annual meeting of shareholders held subsequent to the later
of (1) the first registration of any class of equity securities of the Company
under Section 12 of the Exchange Act or (2) the granting of an Option or Stock
Purchase Right hereunder to an officer or director after such registration, do
the following:

                      (i) furnish in writing to the holders entitled to vote for
the Plan substantially the same information that would be required (if proxies
to be voted with respect to approval or disapproval of the Plan or amendment
were then being solicited) by the rules and regulations in effect under Section
14(a) of the Exchange Act at the time such information is furnished; and


                                      -14-
<PAGE>   15
                      (ii) file with, or mail for filing to, the Securities and
Exchange Commission four copies of the written information referred to in
subsection (i) hereof not later than the date on which such information is first
sent or given to shareholders.

        22. Information to Optionees and Purchasers. The Company shall provide
to each Optionee and Stock Purchase Right holder, during the period for which
such Optionee or holder has one or more Options or Stock Purchase Rights
outstanding, copies of all annual reports and other information which are
provided to all shareholders of the Company.


                                      -15-

<PAGE>   1
                                                                     EXHIBIT 4.5

                            COLLAGEN AESTHETICS, INC.

                        1998 EMPLOYEE STOCK PURCHASE PLAN



     The following constitute the provisions of the 1998 Employee Stock Purchase
Plan of Collagen Aesthetics, Inc.

     1.   Purpose. The purpose of the Plan is to provide employees of the
Company and its Designated Subsidiaries with an opportunity to purchase Common
Stock of the Company. It is the intention of the Company to have the Plan
qualify as an "Employee Stock Purchase Plan" under Section 423 of the Internal
Revenue Code of 1986, as amended. The provisions of the Plan shall, accordingly,
be construed so as to extend and limit participation in a manner consistent with
the requirements of that section of the Code.

     2.   Definitions.

          (a)  "Board" shall mean the Board of Directors of the Company.

          (b)  "Code" shall mean the Internal Revenue Code of 1986, as amended.

          (c)  "Common Stock" shall mean the Common Stock of the Company.

          (d)  "Company" shall mean Collagen Aesthetics, Inc., a Delaware
corporation.

          (e)  "Compensation" shall mean all regular straight time gross
earnings and bonuses and shall not include overtime, shift premiums, payments
for incentive compensation, incentive payments, commissions and other
compensation.

          (f)  "Continuous Status as an Employee" shall mean the absence of any
interruption or termination of service as an Employee. Continuous Status as an
Employee shall not be considered interrupted in the case of a leave of absence
agreed to in writing by the Company, provided that such leave is for a period of
not more than 90 days or reemployment upon the expiration of such leave is
guaranteed by contract or statute.

          (g)  "Contributions" shall mean all amounts credited to the account of
a participant pursuant to the Plan.

          (h)  "Designated Subsidiaries" shall mean the Subsidiaries which have
been designated by the Board from time to time in its sole discretion as
eligible to participate in the Plan.

          (i)  "Distribution Date" shall mean the date on which the Company
distributes on a pro rata basis to holders of the Company's Common Stock all of
the outstanding shares of Cohesion Technologies, Inc. owned by the Company on
such date.

                                       1

<PAGE>   2

          (j)  "Employee" shall mean any person, including an Officer, who is
customarily employed for at least twenty (20) hours per week and more than five
(5) months in a calendar year by the Company or one of its Designated
Subsidiaries.

          (k)  "Exchange Act" shall mean the Securities Exchange Act of 1934, as
amended.

          (l)  "Purchase Date" shall mean the last day of each Purchase Period
of the Plan.

          (m)  "Offering Date" shall mean the first business day of each
Offering Period of the Plan.

          (n)  "Offering Period" shall mean a period of twenty-four (24) months
commencing on January 1 and July 1 of each year, except for the first Offering
Period as set forth in Section 4(a).

          (o)  "Officer" shall mean a person who is an officer of the Company
within the meaning of Section 16 of the Exchange Act and the rules and
regulations promulgated thereunder.

          (p)  "Plan" shall mean this Employee Stock Purchase Plan.

          (q)  "Purchase Period" shall mean a period of six (6) months within an
Offering Period, except for the first Purchase Period as set forth in Section
4(b).

          (r)  "Subsidiary" shall mean a corporation, domestic or foreign, of
which not less than 50% of the voting shares are held by the Company or a
Subsidiary, whether or not such corporation now exists or is hereafter organized
or acquired by the Company or a Subsidiary.

     3.   Eligibility.

          (a)  Any person who is an Employee as of the Offering Date of a given
Offering Period shall be eligible to participate in such Offering Period under
the Plan, subject to the requirements of Section 5(a) and the limitations
imposed by Section 423(b) of the Code.

          (b)  Any provisions of the Plan to the contrary notwithstanding, no
Employee shall be granted an option under the Plan (i) if, immediately after the
grant, such Employee (or any other person whose stock would be attributed to
such Employee pursuant to Section 424(d) of the Code) would own stock and/or
hold outstanding options to purchase stock possessing five percent (5%) or more
of the total combined voting power or value of all classes of stock of the
Company or of any subsidiary of the Company, or (ii) if such option would permit
his or her rights to purchase stock under all employee stock purchase plans
(described in Section 423 of the Code) of the Company and its Subsidiaries to
accrue at a rate which exceeds Twenty-Five Thousand Dollars ($25,000) of fair
market value of such stock (determined at the time such option is granted) for
each calendar year in which such option is outstanding at any time.

                                       2

<PAGE>   3

     4.   Offering Periods and Purchase Periods.

          (a)  Offering Periods. The Plan shall be implemented by a series of
Offering Periods of twenty-four (24) months duration, with new Offering Periods
commencing on or about January 1 and July 1 of each year (or at such other time
or times as may be determined by the Board of Directors). The first Offering
Period shall commence on the later of July 1, 1998 or the Distribution Date (the
"First Offering Date") and continue until June 30, 2000. The Plan shall continue
until terminated in accordance with Section 20 hereof. The Board of Directors of
the Company shall have the power to change the duration and/or the frequency of
Offering Periods with respect to future offerings without shareholder approval
if such change is announced at least fifteen (15) days prior to the scheduled
beginning of the first Offering Period to be affected. Eligible employees may
not participate in more than one Offering Period at a time.

          (b)  Purchase Periods. Each Offering Period shall consist of four (4)
consecutive purchase periods of six (6) months duration. The last day of each
Purchase Period shall be the "Purchase Date" for such Purchase Period. A
Purchase Period commencing on January 1 shall end on the next June 30. A
Purchase Period commencing on July 1 shall end on the next December 31. The
first Purchase Period shall commence on the First Offering Date and shall end on
December 31, 1998. The Board of Directors of the Company shall have the power to
change the duration and/or frequency of Purchase Periods with respect to future
purchases without shareholder approval if such change is announced at least
fifteen (15) days prior to the scheduled beginning of the first Purchase Period
to be affected.

     5.   Participation.

          (a)  An eligible Employee may become a participant in the Plan by
completing a subscription agreement on the form provided by the Company and
filing it with the Company's Human Resources Department prior to the applicable
Offering Date, unless a later time for filing the subscription agreement is set
by the Board for all eligible Employees with respect to a given offering. The
subscription agreement shall set forth the percentage of the participant's
Compensation (which shall be not less than 1% and not more than 15% and which
must be in full percentage increments) to be paid as Contributions pursuant to
the Plan.

          (b)  Payroll deductions shall commence on the first payroll following
the Offering Date and shall end on the last payroll paid on or prior to the last
Purchase Period of the Offering Period to which the subscription agreement is
applicable, unless sooner terminated by the participant as provided in Section
10.

     6.   Method of Payment of Contributions.

          (a)  The participant shall elect to have payroll deductions made on
each payday during the Offering Period in an amount not less than one percent
(1%) and not more than fifteen percent (15%) of such participant's Compensation
on each such payday. All payroll

                                       3

<PAGE>   4

deductions made by a participant shall be credited to his or her account under
the Plan. A participant may not make any additional payments into such account.

          (b)  A participant may discontinue his or her participation in the
Plan as provided in Section 10, or, on one occasion only during the Offering
Period, may decrease the rate of his or her Contributions during the Offering
Period by completing and filing with the Company a new subscription agreement.
The change in rate shall be effective as of the beginning of the next calendar
month following the date of filing of the new subscription agreement, if the
agreement is filed at least ten (10) business days prior to such date and, if
not, as of the beginning of the next succeeding calendar month.

          (c)  Notwithstanding the foregoing, to the extent necessary to comply
with Section 423(b)(8) of the Code and Section 3(b) herein, a participant's
payroll deductions may be decreased to 0% at such time during any Offering
Period which is scheduled to end during the current calendar year that the
aggregate of all payroll deductions accumulated with respect to such Offering
Period and any other Offering Period ending within the same calendar year would
exceed the limitations set forth in such sections. Payroll deductions shall
re-commence at the rate provided in such participant's subscription Agreement at
the beginning of the first Offering Period which is scheduled to end in the
following calendar year, unless terminated by the participant as provided in
Section 10.

     7.   Grant of Option.

          (a)  On the Offering Date of each Offering Period, each eligible
Employee participating in such Offering Period shall be granted an option to
purchase on each Purchase Date a number of shares of the Company's Common Stock
determined by dividing such Employee's Contributions accumulated prior to such
Purchase Date and retained in the participant's account as of the Purchase Date
by the lower of (i) eighty-five percent (85%) of the fair market value of a
share of the Company's Common Stock on the Offering Date, or (ii) eighty-five
percent (85%) of the fair market value of a share of the Company's Common Stock
on the Purchase Date; provided however, that the maximum number of shares an
Employee may purchase during each Purchase Period shall not exceed one thousand
five hundred (1,500), and provided further that such purchase shall be subject
to the limitations set forth in Sections 3(b) and 13. The fair market value of a
share of the Company's Common Stock shall be determined as provided in Section
7(b).

          (b)  The option price per share of the shares offered in a given
Offering Period shall be the lower of: (i) 85% of the fair market value of a
share of the Common Stock of the Company on the Offering Date; or (ii) 85% of
the fair market value of a share of the Common Stock of the Company on the
Purchase Date. The fair market value of the Company's Common Stock on a given
date shall be determined by the Board in its discretion based on the closing
price of the Common Stock for such date (or, in the event that the Common Stock
is not traded on such date, on the immediately preceding trading date), as
reported by the National Association of Securities Dealers Automated Quotation
(Nasdaq) National Market or, if such price is not reported, the mean of the bid
and asked prices per share of the Common Stock as reported by

                                       4

<PAGE>   5

Nasdaq or, in the event the Common Stock is listed on a stock exchange, the fair
market value per share shall be the closing price on such exchange on such date
(or, in the event that the Common Stock is not traded on such date, on the
immediately preceding trading date), as reported in The Wall Street Journal. For
purposes of the Offering Date under the first Offering Period under the Plan,
the fair market value of a share of the Common Stock of the Company shall be the
closing price on the First Offering Date.

     8.   Exercise of Option. Unless a participant withdraws from the Plan as
provided in paragraph 10, his or her option for the purchase of shares will be
exercised automatically on each Purchase Date of an Offering Period, and the
maximum number of full shares subject to the option will be purchased at the
applicable option price with the accumulated Contributions in his or her
account. The shares purchased upon exercise of an option hereunder shall be
deemed to be transferred to the participant on the Purchase Date. No fractional
shares shall be purchased. Any payroll deductions accumulated in a participant's
account which are not sufficient to purchase a full share shall be retained in
the participant's account for the subsequent Purchase Period or Offering Period,
subject to earlier withdrawal by the participant as provided in Section 10. Any
other monies left over in a participant's account after a Purchase Date shall be
returned to the Participant. During his or her lifetime, a participant's option
to purchase shares hereunder is exercisable only by him or her.

     9.   Delivery. As promptly as practicable after each Purchase Date of each
Offering Period, the Company shall arrange the delivery to each participant, as
appropriate, of a certificate representing the shares purchased upon exercise of
his or her option or the deposit of such number of shares with the broker
selected by the Company for administration of Plan stock purchases, as
determined by the Company.

     10.  Voluntary Withdrawal; Termination of Employment.

          (a)  A participant may withdraw all but not less than all the
Contributions credited to his or her account under the Plan at any time at least
ten (10) business days prior to each Purchase Date by giving written notice to
the Company. All of the participant's Contributions credited to his or her
account will be paid to him or her promptly after receipt of his or her notice
of withdrawal and his or her option for the current period will be automatically
terminated, and no further Contributions for the purchase of shares will be made
during the Offering Period.

          (b)  Upon termination of the participant's Continuous Status as an
Employee prior to the Purchase Date of an Offering Period for any reason,
including retirement or death, the Contributions credited to his or her account
will be returned to him or her or, in the case of his or her death, to the
person or persons entitled thereto under Section 15, and his or her option will
be automatically terminated.

          (c)  In the event an Employee fails to remain in Continuous Status as
an Employee of the Company for at least twenty (20) hours per week during the
Offering Period in which the employee is a participant, he or she will be deemed
to have elected to withdraw from

                                       5

<PAGE>   6

the Plan and the Contributions credited to his or her account will be returned
to him or her and his or her option terminated.

          (d)  A participant's withdrawal from an offering will not have any
effect upon his or her eligibility to participate in a succeeding offering or in
any similar plan which may hereafter be adopted by the Company.

     11.  Automatic Withdrawal. If the fair market value of the shares on each
of the first three Purchase Dates of an Offering Period is less than the fair
market value of the shares on the Offering Date for such Offering Period, then
every participant shall automatically (i) be withdrawn from such Offering Period
at the close of such Purchase Date and after the acquisition of shares for such
Purchase Period, and (ii) be enrolled in the Offering Period commencing on the
first business day subsequent to such Purchase Period.

     12.  Interest. No interest shall accrue on the Contributions of a
participant in the Plan.

     13.  Stock.

          (a)  The maximum number of shares of the Company's Common Stock which
shall be made available for sale under the Plan shall be 125,000 shares subject
to adjustment upon changes in capitalization of the Company as provided in
Section 19. If the total number of shares which would otherwise be subject to
options granted pursuant to Section 7(a) on the Offering Date of an Offering
Period exceeds the number of shares then available under the Plan (after
deduction of all shares for which options have been exercised or are then
outstanding), the Company shall make a pro rata allocation of the shares
remaining available for option grant in as uniform a manner as shall be
practicable and as it shall determine to be equitable. In such event, the
Company shall give written notice of such reduction of the number of shares
subject to the option to each Employee affected thereby and shall similarly
reduce the rate of Contributions, if necessary.

          (b)  The participant will have no interest or voting right in shares
covered by his or her option until such option has been exercised.

          (c)  Shares to be delivered to a participant under the Plan will be
registered in the name of the participant or in the name of the participant and
his or her spouse.

     14.  Administration. The Board, or a committee named by the Board, shall
supervise and administer the Plan and shall have full power to adopt, amend and
rescind any rules deemed desirable and appropriate for the administration of the
Plan and not inconsistent with the Plan, to construe and interpret the Plan, and
to make all other determinations necessary or advisable for the administration
of the Plan. The composition of the committee shall be in accordance with the
requirements to obtain or retain any available exemption from the operation of
Section 16(b) of the Exchange Act pursuant to Rule 16b-3 promulgated thereunder.

                                       6

<PAGE>   7

     15.  Designation of Beneficiary.

          (a)  A participant may file a written designation of a beneficiary who
is to receive any shares and cash, if any, from the participant's account under
the Plan in the event of such participant's death subsequent to the end of a
Purchase Period but prior to delivery to him or her of such shares and cash. In
addition, a participant may file a written designation of a beneficiary who is
to receive any cash from the participant's account under the Plan in the event
of such participant's death prior to the Purchase Date of an Offering Period. If
a participant is married and the designated beneficiary is not the spouse,
spousal consent shall be required for such designation to be effective.

          (b)  Such designation of beneficiary may be changed by the participant
(and his or her spouse, if any) at any time by written notice. In the event of
the death of a participant and in the absence of a beneficiary validly
designated under the Plan who is living at the time of such participant's death,
the Company shall deliver such shares and/or cash to the executor or
administrator of the estate of the participant, or if no such executor or
administrator has been appointed (to the knowledge of the Company), the Company,
in its discretion, may deliver such shares and/or cash to the spouse or to any
one or more dependents or relatives of the participant, or if no spouse,
dependent or relative is known to the Company, then to such other person as the
Company may designate.

     16.  Transferability. Neither Contributions credited to a participant's
account nor any rights with regard to the exercise of an option or to receive
shares under the Plan may be assigned, transferred, pledged or otherwise
disposed of in any way (other than by will, the laws of descent and
distribution, or as provided in Section 15) by the participant. Any such attempt
at assignment, transfer, pledge or other disposition shall be without effect,
except that the Company may treat such act as an election to withdraw funds in
accordance with Section 10.

     17.  Use of Funds. All Contributions received or held by the Company under
the Plan may be used by the Company for any corporate purpose, and the Company
shall not be obligated to segregate such Contributions.

     18.  Reports. Individual accounts will be maintained for each participant
in the Plan. Statements of account will be given to participating Employees
promptly following the Purchase Date, which statements will set forth the
amounts of Contributions, the per share purchase price, the number of shares
purchased and the remaining cash balance, if any.

     19.  Adjustments Upon Changes in Capitalization; Corporate Transactions.

          (a)  Adjustment. Subject to any required action by the shareholders of
the Company, the number of shares of Common Stock covered by each option under
the Plan which has not yet been exercised and the number of shares of Common
Stock which have been authorized for issuance under the Plan but have not yet
been placed under option (collectively, the "Reserves"), as well as the price
per share of Common Stock covered by each option under the Plan which has not
yet been exercised, shall be proportionately adjusted for any increase or
decrease in the number of issued shares of Common Stock resulting from a stock
split, reverse

                                       7

<PAGE>   8

stock split, stock dividend, combination or reclassification of the Common
Stock, or any other increase or decrease in the number of shares of Common Stock
effected without receipt of consideration by the Company; provided, however,
that conversion of any convertible securities of the Company shall not be deemed
to have been "effected without receipt of consideration". Such adjustment shall
be made by the Board, whose determination in that respect shall be final,
binding and conclusive. Except as expressly provided herein, no issue by the
Company of shares of stock of any class, or securities convertible into shares
of stock of any class, shall affect, and no adjustment by reason thereof shall
be made with respect to, the number or price of shares of Common Stock subject
to an option.

          (b)  Corporate Transactions. In the event of the proposed dissolution
or liquidation of the Company, the Offering Period will terminate immediately
prior to the consummation of such proposed action, unless otherwise provided by
the Board. In the event of a proposed sale of all or substantially all of the
assets of the Company, or the merger of the Company with or into another
corporation, each option under the Plan shall be assumed or an equivalent option
shall be substituted by such successor corporation or a parent or subsidiary of
such successor corporation, unless the Board determines, in the exercise of its
sole discretion and in lieu of such assumption or substitution, to shorten the
Offering Period then in progress by setting a new Purchase Date (the "New
Purchase Date"). If the Board shortens the Offering Period then in progress in
lieu of assumption or substitution in the event of a merger or sale of assets,
the Board shall notify each participant in writing, at least ten (10) days prior
to the New Purchase Date, that the Purchase Date for his or her option has been
changed to the New Purchase Date and that his or her option will be exercised
automatically on the New Purchase Date, unless prior to such date he or she has
withdrawn from the Offering Period as provided in Section 10. For purposes of
this paragraph, an option granted under the Plan shall be deemed to be assumed
if, following the sale of assets or merger, the option confers the right to
purchase, for each share of option stock subject to the option immediately prior
to the sale of assets or merger, the consideration (whether stock, cash or other
securities or property) received in the sale of assets or merger by holders of
Common Stock for each share of Common Stock held on the effective date of the
transaction (and if such holders were offered a choice of consideration, the
type of consideration chosen by the holders of a majority of the outstanding
shares of Common Stock); provided, however, that if such consideration received
in the sale of assets or merger was not solely common stock of the successor
corporation or its parent (as defined in Section 424(e) of the Code), the Board
may, with the consent of the successor corporation and the participant, provide
for the consideration to be received upon exercise of the option to be solely
common stock of the successor corporation or its parent equal in fair market
value to the per share consideration received by holders of Common Stock and the
sale of assets or merger.

          The Board may, if it so determines in the exercise of its sole
discretion, also make provision for adjusting the Reserves, as well as the price
per share of Common Stock covered by each outstanding option, in the event that
the Company effects one or more reorganizations, recapitalizations, rights
offerings or other increases or reductions of shares of its outstanding Common
Stock, and in the event of the Company being consolidated with or merged into
any other corporation.

                                       8

<PAGE>   9

     20.  Amendment or Termination.

          (a)  The Board of Directors of the Company may at any time terminate
or amend the Plan. Except as provided in Section 19, no such termination may
affect options previously granted, nor may an amendment make any change in any
option theretofore granted which adversely affects the rights of any
participant. In addition, to the extent necessary to comply with Rule 16b-3
under the Exchange Act, or under Section 423 of the Code (or any successor rule
or provision or any applicable law or regulation), the Company shall obtain
shareholder approval in such a manner and to such a degree as so required.

          (b)  Without shareholder consent and without regard to whether any
participant rights may be considered to have been adversely affected, the Board
(or its committee) shall be entitled to change the Offering Periods and Purchase
Periods, limit the frequency and/or number of changes in the amount withheld
during an Offering Period, establish the exchange ratio applicable to amounts
withheld in a currency other than U.S. dollars, permit payroll withholding in
excess of the amount designated by a participant in order to adjust for delays
or mistakes in the Company's processing of properly completed withholding
elections, establish reasonable waiting and adjustment periods and/or accounting
and crediting procedures to ensure that amounts applied toward the purchase of
Common Stock for each participant properly correspond with amounts withheld from
the participant's Compensation, and establish such other limitations or
procedures as the Board (or its committee) determines in its sole discretion
advisable which are consistent with the Plan.

     21.  Notices. All notices or other communications by a participant to the
Company under or in connection with the Plan shall be deemed to have been duly
given when received in the form specified by the Company at the location, or by
the person, designated by the Company for the receipt thereof.

     22.  Conditions Upon Issuance of Shares. Shares shall not be issued with
respect to an option unless the exercise of such option and the issuance and
delivery of such shares pursuant thereto shall comply with all applicable
provisions of law, domestic or foreign, including, without limitation, the
Securities Act of 1933, as amended, the Exchange Act, the rules and regulations
promulgated thereunder, and the requirements of any stock exchange upon which
the shares may then be listed, and shall be further subject to the approval of
counsel for the Company with respect to such compliance.

          As a condition to the exercise of an option, the Company may require
the person exercising such option to represent and warrant at the time of any
such exercise that the shares are being purchased only for investment and
without any present intention to sell or distribute such shares if, in the
opinion of counsel for the Company, such a representation is required by any of
the aforementioned applicable provisions of law.

     23.  Term of Plan; Effective Date. The Plan shall become effective upon the
earlier to occur of its adoption by the Board of Directors or its approval by
the shareholders of the Company. It shall continue in effect for a term of
twenty (20) years unless sooner terminated under Section 20.

                                       9

<PAGE>   10

     24.  Additional Restrictions of Rule 16b-3. The terms and conditions of
options granted hereunder to, and the purchase of shares by, persons subject to
Section 16 of the Exchange Act shall comply with the applicable provisions of
Rule 16b-3. This Plan shall be deemed to contain, and such options shall
contain, and the shares issued upon exercise thereof shall be subject to, such
additional conditions and restrictions as may be required by Rule 16b-3 to
qualify for the maximum exemption from Section 16 of the Exchange Act with
respect to Plan transactions.

                                       10

<PAGE>   11

                            COLLAGEN AESTHETICS, INC.

                        1998 EMPLOYEE STOCK PURCHASE PLAN
                             SUBSCRIPTION AGREEMENT



                                                             New Election ______
                                                       Change of Election ______


     1.   I, ________________________, hereby elect to participate in the
COLLAGEN AESTHETICS, INC. 1998 Employee Stock Purchase Plan (the "Plan") for the
Offering Period ______________, _____ to _______________, _____, and subscribe
to purchase shares of the Company's Common Stock in accordance with this
Subscription Agreement and the Plan.

     2.   I elect to have Contributions in the amount of _____% of my
Compensation, as those terms are defined in the Plan, applied to this purchase.
I understand that this amount must not be less than 1% and not more than 15% of
my Compensation during the Offering Period. (Please note that no fractional
percentages are permitted).

     3.   I hereby authorize payroll deductions from each paycheck during the
Offering Period at the rate stated in Item 2 of this Subscription Agreement. I
understand that all payroll deductions made by me shall be credited to my
account under the Plan and that I may not make any additional payments into such
account. I understand that all payments made by me shall be accumulated for the
purchase of shares of Common Stock at the applicable purchase price determined
in accordance with the Plan. I further understand that, except as otherwise set
forth in the Plan, shares will be purchased for me automatically on the Purchase
Date of each Offering Period unless I otherwise withdraw from the Plan by giving
written notice to the Company for such purpose.

     4.   I understand that I may discontinue at any time prior to the Purchase
Date my participation in the Plan as provided in Section 10 of the Plan. I also
understand that I can decrease the rate of my Contributions to not less than 1%
of my Compensation on one occasion only during any Offering Period by completing
and filing a new Subscription Agreement with such decrease taking effect as of
the beginning of the calendar month following the date of filing of the new
Subscription Agreement, if filed at least ten (10) business days prior to the
beginning of such month. Further, I may change the rate of deductions for future
Offering Periods by filing a new Subscription Agreement, and any such change
will be effective as of the beginning of the next Offering Period. In addition,
I acknowledge that, unless I discontinue my participation in the Plan as
provided in Section 10 of the Plan, my election will continue to be effective
for each successive Offering Period.

<PAGE>   12

     5.   I have received a copy of the Company's most recent description of the
Plan and a copy of the complete "COLLAGEN AESTHETICS, INC. 1998 Employee Stock
Purchase Plan." I understand that my participation in the Plan is in all
respects subject to the terms of the Plan.

     6.   Shares purchased for me under the Plan should be issued in the name(s)
of (name of employee or employee and spouse only):

                                            ------------------------------------

                                            ------------------------------------

     7.   In the event of my death, I hereby designate the following as my
beneficiary(ies) to receive all payments and shares due to me under the Plan:



NAME:  (Please print)                       ------------------------------------
                                            (First)       (Middle)        (Last)

- --------------------                        ------------------------------------
(Relationship)                              (Address)

                                            ------------------------------------

     8.   I understand that if I dispose of any shares received by me pursuant
to the Plan within 2 years after the Offering Date (the first day of the
Offering Period during which I purchased such shares) or within 1 year after the
Purchase Date, I will be treated for federal income tax purposes as having
received ordinary compensation income at the time of such disposition in an
amount equal to the excess of the fair market value of the shares on the
Purchase Date over the price which I paid for the shares, regardless of whether
I disposed of the shares at a price less than their fair market value at the
Purchase Date. The remainder of the gain or loss, if any, recognized on such
disposition will be treated as capital gain or loss.

          I hereby agree to notify the Company in writing within 30 days after
the date of any such disposition, and I will make adequate provision for
federal, state or other tax withholding obligations, if any, which arise upon
the disposition of the Common Stock. The Company may, but will not be obligated
to, withhold from my compensation the amount necessary to meet any applicable
withholding obligation including any withholding necessary to make available to
the Company any tax deductions or benefits attributable to the sale or early
disposition of Common Stock by me.

     9.   If I dispose of such shares at any time after expiration of the 2-year
and 1-year holding periods, I understand that I will be treated for federal
income tax purposes as having received compensation income only to the extent of
an amount equal to the lesser of (1) the excess of the fair market value of the
shares at the time of such disposition over the purchase price which I paid for
the shares under the option, or (2) 15% of the fair market value of the

                                       2

<PAGE>   13

shares on the Offering Date. The remainder of the gain or loss, if any,
recognized on such disposition will be treated as capital gain or loss.

     I understand that this tax summary is only a summary and is subject to
change. I further understand that I should consult a tax advisor concerning the
tax implications of the purchase and sale of stock under the Plan.

     10.  I hereby agree to be bound by the terms of the Plan. The effectiveness
of this Subscription Agreement is dependent upon my eligibility to participate
in the Plan.



SIGNATURE:
           ------------------------------------
SOCIAL SECURITY #:
                  -----------------------------
DATE:
                  -----------------------------


SPOUSE'S SIGNATURE (necessary if beneficiary is not spouse):


- -----------------------------------------------
(Signature)


- -----------------------------------------------
(Print name)

                                       3

<PAGE>   14

                            COLLAGEN AESTHETICS, INC.

                        1998 EMPLOYEE STOCK PURCHASE PLAN

                              NOTICE OF WITHDRAWAL



     I, __________________________, hereby elect to withdraw my participation in
the COLLAGEN AESTHETICS, INC. 1998 Employee Stock Purchase Plan (the "Plan") for
the Offering Period _________. This withdrawal covers all Contributions credited
to my account and is effective on the date designated below.

     I understand that all Contributions credited to my account will be paid to
me within ten (10) business days of receipt by the Company of this Notice of
Withdrawal and that my option for the current period will automatically
terminate, and that no further Contributions for the purchase of shares can be
made by me during the Offering Period.

     The undersigned further understands and agrees that he or she shall be
eligible to participate in succeeding offering periods only by delivering to the
Company a new Subscription Agreement.


Dated:
       ---------------------           -----------------------------------------
                                       Signature of Employee


                                       -----------------------------------------
                                       Social Security Number

<PAGE>   1
                                                                     EXHIBIT 4.6


                            COLLAGEN AESTHETICS, INC.

                        1998 DIRECTORS' STOCK OPTION PLAN


     1.   PURPOSES OF THE PLAN. The purposes of this Directors' Stock Option
Plan are to attract and retain the best available personnel for service as
Directors of the Company, to provide additional incentive to the Outside
Directors of the Company to serve as Directors, and to encourage their continued
service on the Board.

          All options granted hereunder shall be nonstatutory stock options.

     2.   DEFINITIONS. As used herein, the following definitions shall apply:

          (a)  "Board" shall mean the Board of Directors of the Company.

          (b)  "Code" shall mean the Internal Revenue Code of 1986, as amended.

          (c)  "Common Stock" shall mean the Common Stock of the Company.

          (d)  "Company" shall mean Collagen Aesthetics, Inc., a Delaware
corporation.

          (e)  "Continuous Status as a Director" shall mean the absence of any
interruption or termination of service as a Director.

          (f)  "Director" shall mean a member of the Board and in the limited
case of Vested Restructuring Options granted pursuant to Section 4(b)(ii) of the
Plan, a member of the Board of Directors of Cohesion Technologies, Inc.
("Cohesion").

          (g)  "Distribution Date" shall mean the date on which the Company
distributes on a pro rata basis to holders of the Company's Common Stock all of
the outstanding shares of Cohesion owned by the Company (the "Distribution") on
such date.

          (h)  "Employee" shall mean any person, including any officer or
director, employed by the Company or any Parent or Subsidiary of the Company.
The payment of a director's fee by the Company shall not be sufficient in and of
itself to constitute "employment" by the Company.

          (i)  "Exchange Act" shall mean the Securities Exchange Act of 1934, as
amended.

          (j)  "Option" shall mean a stock option granted pursuant to the Plan.
All options shall be nonstatutory stock options (i.e., options that are not
intended to qualify as incentive stock options under Section 422 of the Code).

          (k)  "Optioned Stock" shall mean the Common Stock subject to an
Option.

          (l)  "Optionee" shall mean an Outside Director who receives an Option.

                                       1

<PAGE>   2

          (m)  "Outside Director" shall mean a Director who is not an Employee.

          (n)  "Parent" shall mean a "parent corporation," whether now or
hereafter existing, as defined in Section 424(e) of the Code.

          (o)  "Plan" shall mean this 1998 Directors' Stock Option Plan.

          (p)  "Share" shall mean a share of the Common Stock, as adjusted in
accordance with Section 11 of the Plan.

          (q)  "Subsidiary" shall mean a "subsidiary corporation," whether now
or hereafter existing, as defined in Section 424(f) of the Code.

     3.   STOCK SUBJECT TO THE PLAN. Subject to the provisions of Section 11 of
the Plan, the maximum aggregate number of Shares which may be optioned and sold
under the Plan is 250,000 Shares ("Pool") of Common Stock. The Shares may be
authorized, but unissued, or reacquired Common Stock.

          If an Option should expire or become unexercisable for any reason
without having been exercised in full, the unpurchased Shares which were subject
thereto shall, unless the Plan shall have been terminated, become available for
future grant under the Plan. If Shares which were acquired upon exercise of an
Option are subsequently repurchased by the Company, such Shares shall not in any
event be returned to the Plan and shall not become available for future grant
under the Plan.

     4.   ADMINISTRATION OF AND GRANTS OF OPTIONS UNDER THE PLAN.

          (a)  ADMINISTRATOR. Except as otherwise required herein, the Plan
shall be administered by the Board.

          (b)  PROCEDURE FOR GRANTS. All grants of Options hereunder shall be
automatic and nondiscretionary and shall be made strictly in accordance with the
following provisions:

               (i)  No person shall have any discretion to select which Outside
Directors shall be granted Options or to determine the number of Shares to be
covered by Options granted to Outside Directors.

               (ii) On the Distribution Date, each Outside Director shall be
automatically granted an Option (a "Vested Restructuring Option") to purchase
the number of shares equal to the number of shares granted to the director under
the Collagen Corporation 1990 Directors' Stock Option Plan (the "1990 Plan")
that are vested but not exercised as of such date (the "Vested Collagen
Option").

               (iii) On the Distribution Date, each Outside Director shall be
automatically granted an Option (an "Unvested Restructuring Option") to purchase
the number of shares equal to the number of shares granted to the director under
the 1990 Plan that have not vested as of such date (the "Unvested Collagen
Option").

                                       2

<PAGE>   3

               (iv) Each Outside Director who first becomes an Outside Director
after the effective date of the Plan shall be automatically granted an Option to
purchase 10,000 Shares (the "Initial Option") on the date on which such person
first becomes an Outside Director, whether through election by the stockholders
of the Company or appointment by the Board of Directors to fill a vacancy.

               (v)  Each Outside Director shall be automatically granted an
Option to purchase 5,000 Shares (an "Annual Option") on July 1 of each calendar
year, provided that, as of such date, he or she shall have served on the board
for at least six (6) months.

               (vi) Notwithstanding the provisions of subsections (ii), (iii),
(iv) and (v) hereof, in the event that a grant would cause the number of Shares
subject to outstanding Options plus the number of Shares previously purchased
upon exercise of Options to exceed the Pool, then each such automatic grant
shall be for that number of Shares determined by dividing the total number of
Shares remaining available for grant by the number of Outside Directors
receiving an Option on the automatic grant date. Any further grants shall then
be deferred until such time, if any, as additional Shares become available for
grant under the Plan through action of the stockholders to increase the number
of Shares which may be issued under the Plan or through cancellation or
expiration of Options previously granted hereunder.

               (vii) Notwithstanding the provisions of subsections (ii), (iii),
(iv) and (v) hereof, any grant of an Option made before the Company has obtained
stockholder approval of the Plan in accordance with Section 17 hereof shall be
conditioned upon obtaining such stockholder approval of the Plan in accordance
with Section 17 hereof.

               (viii) The terms of each Vested Restructuring Option granted
hereunder shall be as follows:

                    (1)  the Vested Restructuring Option shall be exercisable
only while the Outside Director remains a Director of the Company or of
Cohesion, except as set forth in Section 9 hereof or in the provisions of the
1990 Plan, as applicable;

                    (2)  the Exercise Price per share shall be determined using
a formula to preserve the spread between the exercise price of the Vested
Collagen Option and the fair market value of the Common Stock of Collagen prior
to the Distribution; and

                    (3)  the Vested Restructuring Option shall be exercisable in
accordance with the terms under which the Vested Collagen Option was granted,
provided, however, that in the case of a Vested Restructuring Option granted to
an Outside Director of Cohesion, service as a Director of Cohesion shall be
equivalent to providing service as a Director of the Company.

               (ix) The terms of each Unvested Restructuring Option granted
hereunder shall be as follows:

                                       3

<PAGE>   4

                    (1)  the Unvested Restructuring Option shall be exercisable
only while the Outside Director remains a Director of the Company, except as set
forth in Section 9 hereof;

                    (2)  the Exercise Price per share shall be determined using
a formula to preserve the portion of the spread between the exercise price of
the Unvested Collagen Option and the fair market value of the Common Stock of
the Company prior to the Distribution that is attributable to the Company; and

                    (3)  the Unvested Restructuring Option shall be exercisable
in accordance with the terms under which the Unvested Collagen Option was
granted.

               (x)  The terms of each Initial Option granted hereunder shall be
as follows:

                    (1)  the Initial Option shall be exercisable only while the
Outside Director remains a Director of the Company, except as set forth in
Section 9 hereof;

                    (2)  the exercise price per Share shall be 100% of the fair
market value per Share on the date of grant of the Initial Option, determined in
accordance with Section 8 hereof; and

                    (3)  the Initial Option shall become exercisable in
installments cumulatively as to 25% of the Shares subject to the Initial Option
on each of the first, second, third and fourth anniversaries of the date of
grant of the Option.

               (xi) The terms of each Annual Option granted hereunder shall be
as follows:

                    (1)  the Annual Option shall be exercisable only while the
Outside Director remains a Director of the Company, except as set forth in
Section 9 hereof;

                    (2)  the exercise price per Share shall be 100% of the fair
market value per Share on the date of grant of the Annual Option, determined in
accordance with Section 8 hereof; and

                    (3)  the Annual Option shall become exercisable as to one
hundred percent (100%) of the Shares subject to the Annual Option on the first
anniversary of the date of grant of the Annual Option.

          (c)  POWERS OF THE BOARD. Subject to the provisions and restrictions
of the Plan, the Board shall have the authority, in its discretion: (i) to
determine, upon review of relevant information and in accordance with Section
8(b) of the Plan, the fair market value of the Common Stock; (ii) to determine
the exercise price per share of Options to be granted, which exercise price
shall be determined in accordance with Section 8(a) of the Plan; (iii) to
interpret the Plan; (iv) to prescribe, amend and rescind rules and regulations
relating to the Plan; (v) to authorize any person to execute on behalf of the
Company any instrument required to effectuate the grant of an Option

                                       4

<PAGE>   5

previously granted hereunder; and (vi) to make all other determinations deemed
necessary or advisable for the administration of the Plan.

          (d)  EFFECT OF BOARD'S DECISION. All decisions, determinations and
interpretations of the Board shall be final and binding on all Optionees and any
other holders of any Options granted under the Plan.

          (e)  SUSPENSION OR TERMINATION OF OPTION. If the Chief Executive
Officer or his or her designee reasonably believes that an Optionee has
committed an act of misconduct, the Chief Executive Officer may suspend the
Optionee's right to exercise any option pending a determination by the Board of
Directors (excluding the Outside Director accused of such misconduct). If the
Board of Directors (excluding the Outside Director accused of such misconduct)
determines an Optionee has committed an act of embezzlement, fraud, dishonesty,
nonpayment of an obligation owed to the Company, breach of fiduciary duty or
deliberate disregard of the Company rules resulting in loss, damage or injury to
the Company, or if an Optionee makes an unauthorized disclosure of any Company
trade secret or confidential information, engages in any conduct constituting
unfair competition, induces any Company customer to breach a contract with the
Company or induces any principal for whom the Company acts as agent to terminate
such agency relationship, neither the Optionee nor his or her estate shall be
entitled to exercise any option whatsoever. In making such determination, the
Board of Directors (excluding the Outside Director accused of such misconduct)
shall act fairly and shall give the Optionee an opportunity to appear and
present evidence on Optionee's behalf at a hearing before the Board or a
committee of the Board.

     5.   ELIGIBILITY. Options may be granted only to Outside Directors. All
Options shall be automatically granted in accordance with the terms set forth in
Section 4(b) hereof. An Outside Director who has been granted an Option may, if
he or she is otherwise eligible, be granted an additional Option or Options in
accordance with such provisions.

          The Plan shall not confer upon any Optionee any right with respect to
continuation of service as a Director or nomination to serve as a Director, nor
shall it interfere in any way with any rights which the Director or the Company
may have to terminate his or her directorship at any time.

     6.   TERM OF PLAN; EFFECTIVE DATE. The Plan shall become effective on the
Distribution Date. It shall continue in effect for a term of ten (10) years
unless sooner terminated under Section 13 of the Plan.

     7.   TERM OF OPTIONS. The term of each Option shall be ten (10) years from
the date of grant thereof.

     8.   EXERCISE PRICE AND CONSIDERATION.

          (a)  EXERCISE PRICE. Except as otherwise provided in Sections
4(b)(viii)(2) and 4(b)(ix)(2) hereof, the per Share exercise price for the
Shares to be issued pursuant to exercise of an Option shall be 100% of the fair
market value per Share on the date of grant of the Option.

                                       5

<PAGE>   6


          (b)  FAIR MARKET VALUE. The fair market value shall be determined by
the Board; provided, however, that in the event the Common Stock is traded on
the Nasdaq National Market or listed on a stock exchange, the fair market value
per Share shall be the closing price on such system or exchange on the date of
grant of the Option (or, in the event that the Common Stock is not traded on
such date, on the immediately preceding trading date), as reported in The Wall
Street Journal, or where there is a public market for the Common Stock, the fair
market value per Share shall be the mean of the bid and asked prices of the
Common Stock in the over-the-counter market on the date of grant, as reported in
The Wall Street Journal (or, if not so reported, as otherwise reported by the
National Association of Securities Dealers Automated Quotation ("Nasdaq")
System).

          (c)  FORM OF CONSIDERATION. The consideration to be paid for the
Shares to be issued upon exercise of an Option shall be determined by the Board
and may consist entirely of (i) cash, (ii) check, (iii) promissory note; (iv)
other Shares of Common Stock having a fair market value on the date of surrender
equal to the aggregate exercise price of the Shares as to which said Option
shall be exercised (which, if acquired from the Company, shall have been held
for at least six months), (v) delivery of a properly executed exercise notice
together with irrevocable instructions to a broker to promptly deliver to the
Company the amount of sale of loan proceeds required to pay the exercise price,
(vi) any combination of such methods of payment, (viii) or any other
consideration or method of payment as shall be permitted under applicable
corporate law.

     9.   EXERCISE OF OPTION.

          (a)  PROCEDURE FOR EXERCISE; RIGHTS AS A STOCKHOLDER. Any Option
granted hereunder shall be exercisable at such times as are set forth in Section
4(b) hereof; provided, however, that no Options shall be exercisable prior to
stockholder approval of the Plan in accordance with Section 17 hereof has been
obtained.

               An Option may not be exercised for a fraction of a Share.

               An Option shall be deemed to be exercised when written notice of
such exercise has been given to the Company in accordance with the terms of the
Option by the person entitled to exercise the Option and full payment for the
Shares with respect to which the Option is exercised has been received by the
Company. Full payment may consist of any consideration and method of payment
allowable under Section 8(c) of the Plan. Until the issuance (as evidenced by
the appropriate entry on the books of the Company or of a duly authorized
transfer agent of the Company) of the stock certificate evidencing such Shares,
no right to vote or receive dividends or any other rights as a stockholder shall
exist with respect to the Optioned Stock, notwithstanding the exercise of the
Option. A share certificate for the number of Shares so acquired shall be issued
to the Optionee as soon as practicable after exercise of the Option. No
adjustment will be made for a dividend or other right for which the record date
is prior to the date the stock certificate is issued, except as provided in
Section 11 of the Plan.

               Exercise of an Option in any manner shall result in a decrease in
the number of Shares which thereafter may be available, both for purposes of the
Plan and for sale under the Option, by the number of Shares as to which the
Option is exercised.

                                       6

<PAGE>   7

          (b)  TERMINATION OF STATUS AS A DIRECTOR. If an Outside Director
ceases to serve as a Director, he or she may, but only within three (3) months
after the date he or she ceases to be a Director of the Company, exercise his or
her Option to the extent that he or she was entitled to exercise it at the date
of such termination. Notwithstanding the foregoing, in no event may the Option
be exercised after its term set forth in Section 7 has expired. To the extent
that such Outside Director was not entitled to exercise an Option at the date of
such termination, or does not exercise such Option (which he or she was entitled
to exercise) within the time specified herein, the Option shall terminate.

          (c)  DISABILITY OF OPTIONEE. Notwithstanding Section 9(b) above, in
the event a Director is unable to continue his or her service as a Director with
the Company as a result of his or her total and permanent disability (as defined
in Section 22(e)(3) of the Code), he or she may, but only within six (6) months
from the date of such termination, exercise his or her Option to the extent he
or she was entitled to exercise it at the date of such termination.
Notwithstanding the foregoing, in no event may the Option be exercised after its
term set forth in Section 7 has expired. To the extent that he or she was not
entitled to exercise the Option at the date of termination, or if he or she does
not exercise such Option (which he or she was entitled to exercise) within the
time specified herein, the Option shall terminate.

          (d)  DEATH OF OPTIONEE. In the event of the death of an Optionee
during the term of the Option who is, at the time of his or her death, a
Director of the Company and who shall have been in Continuous Status as a
Director since the date of grant of the Option, the Option may be exercised, at
any time within six (6) months following the date of death, by the Optionee's
estate or by a person who acquired the right to exercise the Option by bequest
or inheritance, but only to the extent of the right to exercise that had accrued
at the date of death. Notwithstanding the foregoing, in no event may the Option
be exercised after its term set forth in Section 7 has expired.

     10.  NONTRANSFERABILITY OF OPTIONS. The Option may not be sold, pledged,
assigned, hypothecated, transferred, or disposed of in any manner other than by
will or by the laws of descent or distribution or pursuant to a qualified
domestic relations order (as defined by the Code or the rules thereunder). The
designation of a beneficiary by an Optionee does not constitute a transfer. An
Option may be exercised during the lifetime of an Optionee only by the Optionee
or a transferee permitted by this Section.

     11.  ADJUSTMENTS UPON CHANGES IN CAPITALIZATION; CORPORATE TRANSACTIONS.

          (a)  ADJUSTMENT. Subject to any required action by the stockholders of
the Company, the number of shares of Common Stock covered by each outstanding
Option, and the number of shares of Common Stock which have been authorized for
issuance under the Plan but as to which no Options have yet been granted or
which have been returned to the Plan upon cancellation or expiration of an
Option, as well as the price per share of Common Stock covered by each such
outstanding Option, shall be proportionately adjusted for any increase or
decrease in the number of issued shares of Common Stock resulting from a stock
split, reverse stock split, stock dividend, combination or reclassification of
the Common Stock, or any other increase or decrease in the number of issued
shares of Common Stock effected without receipt of

                                       7

<PAGE>   8

consideration by the Company; provided, however, that conversion of any
convertible securities of the Company shall not be deemed to have been "effected
without receipt of consideration." Such adjustment shall be made by the Board,
whose determination in that respect shall be final, binding and conclusive.
Except as expressly provided herein, no issuance by the Company of shares of
stock of any class, or securities convertible into shares of stock of any class,
shall affect, and no adjustment by reason thereof shall be made with respect to,
the number or price of shares of Common Stock subject to an Option.

          (b)  CORPORATE TRANSACTIONS. In the event of (i) a dissolution or
liquidation of the Company, (ii) a sale of all or substantially all of the
Company's assets, (iii) a merger or consolidation in which the Company is not
the surviving corporation, or (iv) any other capital reorganization in which
more than fifty percent (50%) of the shares of the Company entitled to vote are
exchanged, the Company shall give to the Eligible Director, at the time of
adoption of the plan for liquidation, dissolution, sale, merger, consolidation
or reorganization, either a reasonable time thereafter within which to exercise
the Option, including Shares as to which the Option would not be otherwise
exercisable, prior to the effectiveness of such liquidation, dissolution, sale,
merger, consolidation or reorganization, at the end of which time the Option
shall terminate, or the right to exercise the Option, including Shares as to
which the Option would not be otherwise exercisable (or receive a substitute
option with comparable terms), as to an equivalent number of shares of stock of
the corporation succeeding the Company or acquiring its business by reason of
such liquidation, dissolution, sale, merger, consolidation or reorganization.

     12.  TIME OF GRANTING OPTIONS. The date of grant of an Option shall, for
all purposes, be the date determined in accordance with Section 4(b) hereof.
Notice of the determination shall be given to each Outside Director to whom an
Option is so granted within a reasonable time after the date of such grant.

     13.  AMENDMENT AND TERMINATION OF THE PLAN.

          (a)  AMENDMENT AND TERMINATION. The Board may amend or terminate the
Plan from time to time in such respects as the Board may deem advisable;
provided that, to the extent necessary to comply with Rule 16b-3 under the
Exchange Act (or any other applicable law or regulation), the Company shall
obtain approval of the stockholders of the Company to Plan amendments to the
extent and in the manner required by such law or regulation.

          (b)  EFFECT OF AMENDMENT OR TERMINATION. Any such amendment or
termination of the Plan that would impair the rights of any Optionee shall not
affect Options already granted to such Optionee and such Options shall remain in
full force and effect as if this Plan had not been amended or terminated, unless
mutually agreed otherwise between the Optionee and the Board, which agreement
must be in writing and signed by the Optionee and the Company.

     14.  CONDITIONS UPON ISSUANCE OF SHARES. Shares shall not be issued
pursuant to the exercise of an Option unless the exercise of such Option and the
issuance and delivery of such Shares pursuant thereto shall comply with all
relevant provisions of law, including, without limitation, the Securities Act of
1933, as amended, the Exchange Act, the rules and regulations promulgated
thereunder, state securities laws, and the requirements of any stock exchange
upon

                                       8

<PAGE>   9

which the Shares may then be listed, and shall be further subject to the
approval of counsel for the Company with respect to such compliance. As a
condition to the exercise of an Option, the Company may require the person
exercising such Option to represent and warrant at the time of any such exercise
that the Shares are being purchased only for investment and without any present
intention to sell or distribute such Shares, if, in the opinion of counsel for
the Company, such a representation is required by any of the aforementioned
relevant provisions of law.

     15.  RESERVATION OF SHARES. The Company, during the term of this Plan, will
at all times reserve and keep available such number of Shares as shall be
sufficient to satisfy the requirements of the Plan. Inability of the Company to
obtain authority from any regulatory body having jurisdiction, which authority
is deemed by the Company's counsel to be necessary to the lawful issuance and
sale of any Shares hereunder, shall relieve the Company of any liability in
respect of the failure to issue or sell such Shares as to which such requisite
authority shall not have been obtained.

     16.  OPTION AGREEMENT. Options shall be evidenced by written option
agreements in such form as the Board shall approve.

     17.  STOCKHOLDER APPROVAL. The effectiveness of the Plan shall be subject
to approval by the stockholders of the Company. If such stockholder approval is
obtained at a duly held stockholders' meeting, it may be obtained by the
affirmative vote of the holders of a majority of the outstanding shares of the
Company present or represented and entitled to vote thereon. If such stockholder
approval is obtained by written consent, it may be obtained by the written
consent of the holders of a majority of the outstanding shares of the Company.
Options may be granted, but not exercised, before such stockholder approval.

                                       9

<PAGE>   1

                                                                     EXHIBIT 5.1


                               December 28, 1998


Collagen Aesthetics, Inc.
1850 Embarcadero Road
Palo Alto, CA 94303

     REGISTRATION STATEMENT ON FORM S-8
     ----------------------------------

Ladies and Gentlemen:

     We have examined the Registration Statement on Form S-8 (the "Registration
Statement") filed by you with the Securities and Exchange Commission (the
"Commission") on December 30, 1998 in connection with the registration under the
Securities Act of 1933, as amended, of a total of 445,000 shares of your Common
Stock (the "Shares") reserved for issuance under the 1994 Stock Option Plan, the
1998 Employee Stock Purchase Plan and the 1998 Directors' Stock Option Plan. As
your counsel in connection with this transaction, we have examined the
proceedings taken and are familiar with the proceedings proposed to be taken by
you in connection with the sale and issuance of the Shares.

     It is our opinion that upon conclusion of the proceedings being taken or
contemplated by us, as your counsel, to be taken prior to the issuance of the
Shares, and upon completion of the proceedings being taken in order to permit
such transactions to be carried out in accordance with the securities laws of
the various states where required, the Shares when issued and sold in the manner
described in the Registration Statement will be legally and validly issued,
fully paid and non-assessable.

     We consent to the use of this opinion as an exhibit to the Registration
Statement and further consent to the use of our name wherever appearing in the
Registration Statement, including the Prospectus constituting a part thereof,
and in any amendment thereto.


                                        Very truly yours,

                                        VENTURE LAW GROUP
                                        A Professional Corporation


                                        /s/ VENTURE LAW GROUP
                                        

                                      -9-

<PAGE>   1

                                                                    EXHIBIT 23.2


               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS



We consent to the incorporation by reference in the Registration Statement (Form
S-8) pertaining to the 1994 Stock Option Plan, 1998 Employee Stock Purchase Plan
and 1998 Directors' Stock Option Plan of Collagen Aesthetics, Inc. of our report
dated July 31, 1998, with respect to the consolidated financial statements and
schedule of Collagen Aesthetics, Inc. included in its Annual Report (Form 10-K)
for the year ended June 30, 1998, filed with the Securities and Exchange
Commission.

                                        ERNST & YOUNG LLP

                                        /s/ ERNST & YOUNG LLP
                                       



Palo Alto, California
December 23, 1998



                                      -10-



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