AMENDMENT OF PROMISSORY NOTE This Amendment of Promissory Note is made as of July 15, 1998, between KeraVision, Inc. (the "Company") and Thomas A. Silvestrini (the "Purchaser"). The Promissory Note ("Note") executed by the Purchaser on July 15, 1996,...Promissory Note • November 12th, 1998 • Keravision Inc /Ca/ • Ophthalmic goods
