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Method of producing annealed polyvinyl alcohol contact lens

  • US 4,619,793 A
  • Filed: 07/26/1984
  • Issued: 10/28/1986
  • Est. Priority Date: 04/29/1982
  • Status: Expired due to Fees
First Claim
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1. In a method of providing corrected vision in patients in need of the same comprising wearing a soft contact lens on the surface of the cornea, the improvement wherein the soft contact lens is an optically clear soft contact lens of swollens solid polyvinyl alcohol having a weight average molecular weight of at least about 6,000, which has been annealed, without prior crosslinking, under crystallinity promoting conditions, to substantially increase the crystallinity thereof, and swollen in a swelling solvent, the resultant annealed, swollen lens possessing an oxygen transmissibility capability in an aqueous environment in excess of that necessary to meet the needs of the human cornea.

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