Soft gas permeable contact lens having improved clinical performance

CAFC
  • US 5,712,327 A
  • Filed: 06/16/1992
  • Issued: 01/27/1998
  • Est. Priority Date: 01/07/1987
  • Status: Expired due to Term
First Claim
Patent Images

1. A hydrophilic soft gas permeable contact lens comprised of a polymerization product of a composition comprising a polymerizable vinylic siloxane monomer and a hydrophilic vinylic monomer, and having at least 25% water by weight and characterized by high oxygen permeability, softness, rebound elasticity and a high degree of clinical performance, said lens comprising a hydrophilic lens body and a tear-wettable surface layer integral therewith, said lens body being comprised of said polymerization product and said tear-wettable surface layer being comprised of polymeric material containing hydroxy acrylic monomer units, and wherein the proportion of hydroxy acrylic monomer units to silicon units in said tear-wettable surface layer is greater than that of said lens body.

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