AMENDMENT
                                          OF
                                PRODUCT MANUFACTURING
                                 AND SALES AGREEMENT
                                           


     THIS AMENDMENT OF THE PRODUCT MANUFACTURING AND SALES AGREEMENT 
(this "Amendment") is made and entered into as of the 11th day of August, 
1997 between POLYCORE OPTICAL, PTE. LTD. ("Seller") and VISION-EASE LENS, 
INC., successor in interest to Vision-Ease, a unit of BMC Industries, Inc. 
("Buyer").

                                       RECITALS
                                           
     WHEREAS, Buyer's predecessor, Vision-Ease, a unit of BMC 
Industries, Inc., and Seller are parties to that certain Product 
Manufacturing and Sales Agreement dated as of the 17th day of October, 1994 
(the "Agreement");

     WHEREAS, Buyer and Seller desire to amend the Agreement upon the 
terms and conditions, and in the manner set forth below; and

     WHEREAS, it is intended by this Amendment to amend the Agreement.

     NOW, THEREFORE, in consideration of the foregoing premises and for 
other good and valuable consideration, the receipt and sufficiency of which 
are hereby acknowledged, the parties hereto agree as follows:

     1) SPECIFICATIONS.  Section 3.2 of the Agreement is hereby amended such
        that the words "Buyer's Vice President of Sales and Marketing" are
        replaced with "Buyer's Vice President of International Sales".

     2) PRICE.  Section 5.1(b) of the Agreement is hereby amended such that
        the words "each of years two and three of this contract" are replaced
        with "year 2 of this Amendment".

     3) CUSTOMER RETURNS.  Section 6.2 of the Agreement is hereby amended by
        adding the words", at Seller's expense," to line 3 of such section
        following "forwarded to Seller".

     4) IMPROVEMENTS.  Section 7.2 of the Agreement is hereby amended such
        that the word "U.S." is replaced with "worldwide".

     5) PATENT INDEMNIFICATION.  Buyer agrees that it will indemnify and hold
        harmless Seller from and against any loss, damage, cost including
        attorney fees or liability which may be incurred by Seller, based on a
        claim that the manufacturign process used for any of the Products
        furnished hereunder infringes any patent of the United States or any
        other country, and that Buyer, will, at its own expense, defend any
        action, suit or proceeding which is based on an allegation that the
        manufacturing process used for any Product manufactured by Seller and
        sold to Buyer hreunder constitutes an infringement of any patent of
        the United States or any other county; provided, that:
         
         a) Seller immediately notifies Buyer in writing of the existence of
            any notice or claim or inforingement and of any such action, suit
            or proceeding upon Seller's discovery of the exitence thereof.
          
         b) Seller gives Buyer full control of the defense of any such suit,
            including appeals from any judgment therein and any negotiations
            for the settlement or compromise thereof with full authority to
            enter into a binding settlement or compromise; and
          
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         c) Sller cooperates with Buyer, at Buyer's expense, in the defense
            thereof.
                    
            In the event that the manufacturing process used for any such 
            Products are held to constitute an infringement and the use, 
            possession, sales, reproduction or distribution thereof is 
            enjoined, Buyer shall use its best efforts to replace such 
            infringing process during the terms of this Agreement with 
            non-infringing process at Buyer's expense.
          
     6)  TERM.  The term of the Agreement as set forth in Section 10.1 of the
         Agreement shall be extended for an additional period of two years,
         which shall commence as of the date of the expiration of the original
         term of the Agreement.

     7)  TERMINATION FOR BREACH.  Section 10.2 of the Agreement is hereby
         amended by deleting the words "without further notice," and by adding
         the words "if Buyer fails to cure such default within five (5)
         business days of written demand of Seller" following "to immediately
         terminate this Agreement".

  
     8)  OTHER TERMINATION.  Section 10.3 of the Agreement is hereby amended by
         adding the following language at the end of such section: 

            In case of the breach of contractual commitment by Vision-Ease or 
            any affiliated entity or new principal as described in 10.3, 
            Polycore Optical has the right to sell back to Vision-Ease at then 
            present net book value, the molds, lenses, equipment, and other
            facilities which are related in one way or another to the
            manufacturing of lenses for Vision-Ease."

     9)  CONFIDENTIALITY.  Section 12.1 of the Agreement is hereby amended by
         relettering subsection (d) as (e) and adding the following as the new
         subsection (d):

            "is independently developed by the employees or other affiliates of
            the receiving party without access to the confidential
            information; or"

    10)  PUBLICITY.  The following sentence is added at the end of Section
         13.1:

            "Notwithstanding the foregoing, Buyer shall have authority to 
            disclose such terms as required under law or court order upon the 
            opinion of counsel that such disclosure is required."

    11)  NOTICES.  Section 13.2 is hereby amended by adding the words "Lens,
         Inc." following the words "Vision-Ease".  All notices should be sent
         to the attention of the Vice President of International Sales.  The
         telecopier number is (612) 536-8789.

    12)  ASSIGNMENT; BINDING AFFECT.  Section 13.3 of the Agreement is hereby
         amended by adding the words "to an affiliated entity or" following the
         word "except".

    13)  EXHIBITS.  Exhibits A through G of the Agreement shall be  superceded
         in their entirety and replaced with Exhibits A through G attached to
         this Amendment effective as of the expiration of the original term of
         the Agreement and concurrent with the beginning of the term extension
         set forth in Section 7 of this Amendment.

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    IN WITNESS WHEREOF, Seller and Buyer have caused this Amendment to be duly
executed as of the date first above written.



POLYCORE OPTICAL, PTE. LTD.          VISION-EASE LENS, INC.           
                                                                        
By:    /s/Dr. Sammy  Sumargo        By:    /s/Richard J. Montag     
                                                                        
Its:   Managing Director           Its:   Vice President International Sales


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