Document:

<PAGE>

                                                                   EXHIBIT 10.50

Negotiated in Pinneberg, November 29 1999

In the offices of Axel Mallick - acting as a notary public - appeared the
personally known                  , born 08/05/45, merchant, (address)

Acting on behalf of

    1. himself
    2. Dr. Volker D. Anhacusser, who is acting on behalf of Staar Surgical AG,
       Nidau, Switzerland as their trustee

The appeared              asked the notary to certify the following:

Preamble

The acting person No. 1 (     ) owns shares (share capital) of
    , being registered in the commercial register of the county court of
in the amount of 400,000.-, as the acting person No. 2 (VDA) owns a share
capital of DM 600,000.- of the total nominal capital of 1 Million DM.

                                       I.

Division of the share capital unit, Assignment

The acting person              is dividing his share capital unit into two equal
parts of DM 200,000.- each.

Thereafter the acting person 1         assigns the newly formed share unit of DM
200,000.- to the acting person No. 2, VDA. VDA is accepting the assignment in
his own name, however as the trustee of Staar Surgical AG, the buyer. The acting
person gives his consent for the assignment.

                                      II.

Sales Act

The acting person No. 2 (VDA) will perform the following compensation for the
transfer of the shares

    1. He pays a purchase price of DM 3,426,000.- being due and payable as
       follows:

            a) DM 2,000,000.- until Sept. 30 1999
            b) DM   800,000.- until Dec. 01 1999
            c) DM   626,000.- until Feb. 01 2000

       To be paid on the bank account of the acting person No. 1

    2. The acting person No. 2 will furthermore transfer 125,000 shares of Staar
       Surgical Company, Monrovia, CA. until Sept. 30 1999.
<PAGE>

                                     III.

Warranties and Representations

The seller did the assignment without any warranties and representations.

The seller however guarantees, that he owns the assigned share capital as his
personal property without any limitations and restrictions, he especially
guarantees, that he has not assigned the share capital to a third party nor that
the shares have been incriminated or seized as a security. The articles of
incorporation               have not been changed since Jan. 1 1998.

        guarantees, that he has paid the initial capital to    in full. None of
the share capital has been repaid. The shares are not incriminated. The basis
of this agreement, especially for estimating the purchase price, is the audit of
BDO of Jan. 1999 as well as the financial statements, that has been provided to
the buyer, VDA, prior to the sale of the shares. The financial statements have
been set up according the principles of fair and continuous accounting under
respect of the continuity. They show the real status of the company, in
concern of the value, the financial and profit situation. Depreciations
devaluations, if they were done, value corrections and contingent liabilities,
csp. for taxes, were made in a reasonable amount. The seller also guarantees,
that he has informed the buyer about all important and essential developments
and incidents of the company. The company does not own real estate.

                                      IV.

The day of transfer of the rights

The shares are economically being transferred on Oct 1 1999.

Therefore the parties agree that 3/4 of the shown profits of the company are
paid out in relation of the share ownership prior to the sales act (60% VDA /
40%   ). One quarter of the profits will be paid out according to the present
relation in the participation of the company (80% VDA / 20%   ).

                                      V.

Costs

Will be taken care of by the buyer incl. event. Taxes in concern of the sales
act.

Rest of the text are formalities.<PAGE>

                                                                   EXHIBIT 10.51

                    EQUIPMENT PURCHASE AND SALE AGREEMENT

     THIS EQUIPMENT PURCHASE AND SALE AGREEMENT (the "Agreement"), dated this
6th day of May, 1999 (the "Effective Date"), is entered into by and between
STAAR Surgical Company, a Delaware corporation ("STAAR"), and Lenstec,
Incorporated, a Florida corporation, ("Lenstec") based upon the following.

                                   RECITALS

     A.     Lenstec is the developer and manufacturer of certain production
equipment and manufacturing technology used for the manufacture of three-piece
intraocular lenses used in ophthalmic surgery;

     B.     STAAR desires to obtain the right to purchase Lenstec manufacturing
technology ("Technology") and purchase IOL manufacturing equipment ("Equipment")
from Lenstec for installation and use in the manufacturing of three (3) piece
and plate haptic Collomer IOLs in one of its production facilities.

     NOW, THEREFORE, in consideration of the mutual promises above and the
agreements contained herein, the parties hereby agree as follows:

                                   AGREEMENT

                                   ARTICLE 1
                      PURCHASE OF MANUFACTURING EQUIPMENT

     1.1     Purchase of Technology.  Lenstec agrees to sell to STAAR its
             ----------------------
Technology, including its trade secrets and manufacturing technology, relating
to the manufacture of three-piece and plate haptic Hydro Acrylic IOLs.  Lenstec
agrees that included in this purchase of technology will be the development of
haptic design and assembly technique (as used in the Lenstec LH 3000
HEMA/acrylic copolymer lens) for a Staar developed collamer lens.  This also
includes the installation of the process, the training of Staar personnel in the
manufacture of this lens and supplying standard operating procedures for the
process.

      1.2    Consent to Technology Transfer. To induce STAAR to enter into this
             ------------------------------
Agreement and to consummate the transactions contemplated by it, Lenstec hereby
represents, warrants and covenants that as of the date of execution of this
Agreement, it will have the right to sell its Equipment and training for the use
of the equipment, relating to the manufacture of three-piece Hydro Acrylic IOLs
and to sell the Equipment, all pursuant to the terms of this Agreement.

                                   ARTICLE 2
                             TERMS AND CONDITIONS

      2.1     Term.  This Agreement shall remain in effect for a period of three
              ----
(3) years from the date that it is executed by STAAR and Lenstec (the "Effective
Period").  During the Effective Period STAAR shall have the right to purchase,
and Lenstec will be obligated to sell, the Equipment at List Prices set forth in
Exhibit "A" and in quantities not to exceed those set forth in Exhibit "B".  At
the end of the Effective Period, this Agreement will terminate with respect to
Lenstec's obligations to supply equipment and installation assistance.
<PAGE>

     2.2     Equipment Purchase Orders.  Within 60 days of the execution of this
             -------------------------
Agreement, STAAR shall provide to Lenstec an estimate of its timetable and
preliminary quantities for required Equipment, which information STAAR agrees to
update periodically.  Upon submitting a purchase order ("Purchase Order") for
Equipment, STAAR shall give Lenstec its target delivery/installation date.

     2.3     Shipment.  With the exception of those items of Equipment
             --------
designated on Exhibits "A" and "B" as "delivered and installed", which items
Lenstec will ship at its expense, all Equipment supplied pursuant to this
Agreement will be delivered FOB Lenstec's facility in St. Petersburg, Florida.
Lenstec will ship the Equipment pursuant to STAAR's written instructions to
STAAR's facility in Switzerland or California.  All customs, duties, costs,
taxes, insurance premiums and other expenses relating to transportation and
shipment of the Equipment shall be at STAAR's expense.

     2.4     Standard Warranty.  All Equipment will be subject to Lenstec's
             -----------------
standard manufacturer's warranty for IOL Manufacturing Equipment, a copy of
which is attached as Exhibit "C" to this Agreement.

     2.5     Installation and Training.  Lenstec personnel shall be available to
             -------------------------
provide technical assistance in connection with the installation and testing of
the Equipment.  In addition, Lenstec technical personnel shall provide, as
required but subject to certain limitations, training assistance to STAAR
manufacturing personnel in the operation and service of the Equipment.

     2.6     Breach.  Failure by Lenstec to supply STAAR with the Equipment
             ------
ordered according to the terms of this Agreement (other than as a result of
force majeure, as set forth in Section 9.12) shall be considered a material
breach of this Agreement.

                                   ARTICLE 3
                              PRICE AND PAYMENTS

     3.1     Technology Transfer Fee.  Upon the execution of this Agreement,
             -----------------------
STAAR shall deposit with Lenstec the sum of four hundred thousand U.S. dollars
(U.S. $400,000) to be earned by Lenstec as follows:

             (a)     $100,000.00 will be earned by Lenstec upon the successful
                     manufacturing of lense optics made from collomer at either
                     Lenstec's Florida or Barbados facilities. Testing will be
                     completed within three weeks after signing this agreement.

             (b)     $100,000.00 will be earned by Lenstec if the Equipment
                     purchased by Staar in its first purchase order as set forth
                     on Exhibit "A" is delivered and installed at STAAR's
                     Monrovia facility within five (5) months from the date
                     STAAR submits its purchase order to Lenstec;

             (c)     $100,000 will be earned by Lenstec if, within five months
                     after installation of the Equipment set forth on Exhibit
                     "A", STAAR using commercially reasonable efforts, is
                     successful in using the Equipment to manufacture at least
                     10,000 lenses;

             (d)     $100,000 will be earned by Lenstec after the successful
                     delivery and installation to STAAR of the Equipment set
                     forth on Exhibit "B".

       If, through no fault whatsoever of STAAR, any of the above milestones are
not achieved, STAAR at its sole discretion may decide not to purchase the
equipment.  If it so decides then the amount deposited

                                       2
<PAGE>

(without any premium) will be applied to the purchase of lenses pursuant to the
terms of that certain License & Technology agreement of even date herewith, a
copy of which is attached hereto as Exhibit "D".  It is further agreed that if
the collomer material proved to be not suitable for machining into this design
of lense and STAAR decides not to go ahead with this design of lens, the
technology transfer fee will be applied to the purchase of LH 3000 lenses.  The
application of the remaining deposit will be made at the rate of $10.00 per lens
on the lenses sold to STAAR in the second year of the License and Supply
agreement herein attached.

     3.2  Price of Equipment.  Lenstec agrees to provide the Equipment for the
          ------------------
List Prices set forth in Exhibit "A" attached hereto.  Such List Prices are
effective through December 31, 1999; thereafter, List Prices are subject to an
adjustment.

     3.3  Payment Terms.  Equipment purchase orders shall be subject to the
          -------------
following payment terms:

          Percentage of List Price     Timing
          ------------------------     ------
                    30%                upon placement of purchase order
                    30%                60 days from placement of purchase order
                    20%                within 10 days after delivery of all
                                       Equipment ordered with the purchase order
                    20%                within 10 days after satisfactory
                                       installation of all Equipment at STAAR's
                                       facility

     3.4  Technical Assistance.  Lenstec will absorb all personnel costs
          --------------------
relative to the installation and testing of the Equipment. In addition, Lenstec
agrees to supply up to 240 man-hours of training-related assistance with respect
to the operation of the Equipment. Additional technical assistance from Lenstec
personnel will be available at a cost to STAAR of $800/man-day. All out-of-
pocket expenses incurred by Lenstec technical assistance personnel shall be
documented by Lenstec and reimbursed at cost by STAAR.

     3.5  Shipping Costs.  With the exception of those items of Equipment
          --------------
designated on Exhibits "A" and "B" as "delivered and installed", which items
Lenstec will ship to Monrovia California at its expense, STAAR shall be
responsible for the payment of all costs relating to shipping the Equipment from
St. Petersburg to STAAR's facility.  Should STAAR decide to build the laboratory
in Switzerland, Lenstec will credit STAAR with the amount it would have cost to
ship the "delivered and installed" equipment to Monrovia California.

     3.6  Design Changes.  In the event that STAAR requests modifications to the
          --------------
technical design Equipment, Lenstec will cooperate in modifying the Equipment,
as requested. The payment of the costs of such modifications will be the
responsibility of STAAR.

     3.7  Payments.  All payments shall be forwarded to the following bank
          --------
account:

               Barclays Bank PLC New York
               ABA 026002574
               Chips UID 240280
               Beneficiary:
               Barbados Offshore Bank Unit
               A/C# 280 90 82/4677
               For credit to:
               Lenstec Barbados Inc.
               A/C# 23 103-22-58
<PAGE>

                                  ARTICLE 4
                              CONFIDENTIALITY

     4.1    Duty of Confidentiality Relating to Trade Secrets and Proprietary
            -----------------------------------------------------------------
Information.
-----------
Each party ("Receiving Party") shall maintain in confidence and keep safe from
third parties all information disclosed by the other ("Disclosing Party") which
such party knows or has reason to know comprises trade secrets and other
proprietary information of the other, including, without limitation, information
relating to the Product. Each party shall use its best efforts to ensure that
its employees, consultants and agents do not disclose to third parties such
trade secrets or proprietary information. Each party shall notify the other
promptly upon discovery of any unauthorized use or disclosure of the
other's trade secrets or proprietary information.

     4.2    Exceptions.  The obligation of confidentiality contained in this
            ----------
Agreement shall not apply to the extent that: (a) the Receiving Party is
required to disclose the information by applicable law, regulation or order of a
governmental agency or a court of competent jurisdiction; (b) the Receiving
Party can demonstrate that the disclosed information was at the time of
disclosure already in the public domain other than as a result of actions or
failure to act by the Receiving Party in violation hereof; (c) the disclosed
information was rightfully known by the Receiving Party (as shown by its written
records) prior to the date of disclosure to the Receiving Party in connection
with this Agreement; or (d) the disclosed information was received by the
Receiving Party on an unrestricted basis from a source which is neither STAAR
nor Lenstec and which is not under a duty of confidentiality to the other party.

                               ARTICLE 5
                             MISCELLANEOUS

     5.1     Governing Law.  This Agreement shall be governed by and interpreted
             -------------
in accordance with the laws of the State of California.

     5.2     Dispute Resolution/Arbitration. All disputes shall be amicably
             ------------------------------
resolved, and if not so resolved, they shall be subject to arbitration as
follows: (i) if Lenstec initiates a claim or demand against STAAR, then the
arbitration shall be conducted in accordance with the rules of the American
Arbitration Association and the location of arbitration shall be in Southern
California; and (ii) if STAAR initiates a claim or demand against Lenstec, then
the arbitration shall be conducted in accordance with the commercial arbitration
rules of the American Arbitration Association and the location of arbitration
shall be Florida. Further, (iii) the arbitration shall be conducted in the
English language. (iv) the award of the arbitrators will be final and binding
upon the parties. Judgment upon the award may be entered in any court having
jurisdiction. An application may be made to any such court for judicial
acceptance of the award and an order of enforcement. (v) Any arbitration
proceeding hereunder shall be conducted on a confidential basis. (vi) The
arbitrator shall apply the principles of the laws of the State of California.

     5.3     Notice.  Unless otherwise specifically provided in this Agreement,
             ------
all notices, demands, requests, consents, approvals or other communications
(collectively and severally called "Notices") required or permitted to be given
hereunder, or which are given with respect to this Agreement, shall be in
writing, and shall be given by: (A) personal delivery (which form of Notice
shall be deemed to have been given upon delivery), (B) by telegraph or by
private airborne/overnight delivery service (which forms of Notice shall be
deemed to have been given upon confirmed delivery by the delivery agency), (C)
by electronic or facsimile or telephonic transmission, provided the receiving
party has a compatible device or confirms receipt thereof (which forms of Notice
shall be deemed delivered upon confirmed transmission or confirmation of
receipt), or (D) by mailing in the United States mail by registered or certified
mail, return receipt requested, postage prepaid (which forms of Notice shall be
deemed to have been given upon the fifth (5th) business day following the date
mailed). Notices shall be addressed as follows, or to such other address as the
receiving party shall have specified most recently by like Notice, with a copy
to the other parties hereto.
                                       4
<PAGE>

            To STAAR:     STAAR Surgical Company
                          1911 Walker Avenue
                          Monrovia, California 91016
                          Attention: John Wolf, President
                          PH: 626/303-7902
                          FAX: 626/358-3049

                                       5
<PAGE>

        To Lenstec,Inc:      Lenstec,Inc.
                             2860 Soherer Drive 600, Suite 600
                             St. Petersburg, Florida 33716
                             Attention:  John Clough, President
                             PH:  727/571-2272
                             FAX:  727/571-1792

        5.4       Captions. The caption, articles, sections and subsections of
                  --------
this Agreements are solely for convenience of reference and shall not affect
its interpretation.

        5.5       Entire Agreement. This Agreement represents the entire
                  ----------------
understanding between the parties with respect to the subject matter hereof,
and supersedes all prior agreements, negotiations, understandings, letters of
intent, representations, statements and writings between the parties relating
thereto. No modification, alteration, waiver or change in any of the terms of
this Agreement shall be valid or binding upon the parties hereto unless made in
writing and duly executed on behalf of the party to be charged therewith.

        5.6     Assignability. This Agreement may not be assigned or
                -------------
transferred in any manner by either party without the prior written consent of
the other party, except that either party may assign or transfer this Agreement
to a third party in connection with the transfer or sale of all or substantially
all of its business to which this Agreement pertains or the merger of
consolidation of a party with or into a third party if said third party agrees
in writing to accept all of the terms and conditions of this Agreement. Any
attempted assignment or transfer in violation of this Section 5.6 shall be void.

        5.7      Waiver. The waiver by either party of a breach of any
                 ------
provision contained herein shall in no way be construed as a waiver of any
subsequent breach of such provision or the waiver of the provisions itself.

        5.8     Invalidity of a Particular Provision. The invalidity or
                ----------------------------------
unenforceability of any term, provision, clause or any portion thereof of this
Agreement shall in no way impair or affect the validity or enforcement of any
other provision of this Agreement.

        5.9     Survival. The provisions which by their meaning and intent have
                --------
applicability beyond the term of this Agreement shall survive the expiration or
termination of this Agreement.

        5.10    Relationship of the Parties.  The relationship between STAAR and
                ---------------------------
Lenstec is and shall be that of vendor and vendee. Neither party, nor its agents
and employees, shall under any circumstances be deemed agents or representatives
of the other and neither shall have authority to act for and/or bind the other
in any way, or represent that it is in any way responsible for acts of the
other. This Agreement does not establish a joint venture, agency or
partnership between the parties, nor does it create an employer/employee
relationship.

        5.11    Counterparts. This Agreement may be executed in several
                -----------
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument. If this Agreement is
executed in counterparts, no signatory hereto shall be bound until both the
parties named below have duly executed or caused to be duly executed a
counterpart of this Agreement.

        5.12    Expenses. The prevailing party in any legal action to enforce or
                --------
interpret this Agreement shall be entitled to reimbursement of its costs and
attorneys' fees in such action by the other party.

        5.13    Force Majeure. A party shall not be liable for nonperformance or
                -------------
delay in performance caused by any event reasonably beyond the control of such
party (provided such party shall use its best efforts to return to normal
operations); including but not limited to wars, hostilities, revolutions, riots,

                                       6
<PAGE>

civil commotion, national emergency, epidemics, fire, flood, earthquake,force of
nature, explosion, embargo, or any other Act of God, or any law, proclamation,
regulation, ordinance, or other act or order of any court, government or
governmental agency.

           5.14  Time.  The parties agree that time is of the essence in the
                 ----
performance of obligations under this Agreement.

           5.15  Specific Performance.  The parties acknowledge and agree that
                 --------------------
STAAR will suffer irreparable harm in the event of a material breach of
Lenstec's obligation to supply Equipment in accordance with the terms hereof.
Accordingly, Lenstec agrees that STAAR will, in addition to any other remedies
available to it at law or in equity, be entitled to injunctive relief to enforce
Lenstec's obligation to supply equipment in accordance with the terms hereof.

           5.16  Confidentiality.  The terms and conditions of this Agreement
                 ---------------
shall be confidential and shall not be disclosed by any of the parties to this
Agreement to any third party, other than to an actual or potential affiliate,
successor or assign, except that any party may disclose the terms and conditions
of this Agreement (i) to its legal or accounting advisors, as necessary, so long
as they agree to be bound by the terms of this confidentiality provision; or
(ii) if such party receives a subpoena or other process or order to produce this
Agreement, provided that such party shall, prior to any disclosure to any third
party, promptly notify the other party to this Agreement so that the party has a
reasonable opportunity to respond to such subpoena, process or order; or (iii)
as otherwise required by law.  The party receiving the subpoena, process or
order shall take no action contrary to the confidentiality provisions set forth
above and shall make reasonable efforts to produce only subject to a protective
order.  The party objecting shall have the burden of defending against such
subpoena, process or order.  The party receiving the subpoena, process or order
shall be entitled to comply with it except to the extent that any other party is
successful in obtaining an order modifying or quashing it.

      IN WITNESS WHEREOF, the parties have caused this Agreement to be executed
as of the date first written above.

STAAR SURGICAL COMPANY                       LENSTEC, INC.

By:   /s/ John R. Wolf                       By:    /s/ John Clough
    -------------------------------              --------------------------

Title:   President                           Title:   President
       ----------------------------                 -----------------------

Date:    5/11/99                             Date:    5/6/99
       ----------------------------                 -----------------------

                                       7
<PAGE>

                                  EXHIBIT "A"

                          IOL MANUFACTURING EQUIPMENT

                      EFFECTIVE LIST PRICES - APRIL 1999

<TABLE>
<CAPTION>

Description                                                     List Price
-----------                                                     ----------
<S>                                                             <C>
Lenstec Lenslathes delivered and installed                      $85,000.00
Lenstec Lensmill delivered and installed                        $85,000.00
Rotlex Lens analyzers                                           $30,000.00
CNC edge hole drills with fixturing                             $20,000.00
Three tier tumble polisher                                      $17,000.00
Optical comparators                                             $ 8,500.00
Additional inspection stations                                  $30,000.00
Lens Blocking and deblocking system                             $ 5,000.00
Second Cut Blocks (each)                                        $    15.00
</TABLE>

                                       8

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