Extended wear ophthalmic lens

  • US 6,951,894 B1
  • Filed: 08/17/2000
  • Issued: 10/04/2005
  • Est. Priority Date: 09/06/1994
  • Status: Expired due to Fees
First Claim
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1. A method for producing an extended wear contact lens, said contact lens comprising a core polymeric material which has a high oxygen permeability and a high ion or water permeability, which method comprises the steps of:

  • a) preparing a lens formulation comprising an oxyperm polymerizable material selected from the group consisting of fluorine-containing macromers and flourine-containing monomers, and an ionoperm polymerizable material selected from the group consisting of acrylates, methacrylates, polyalkylene glycols and N-vinyl pyrrolidones, wherein said oxyperm polymerizable material comprises between about 30% to about 70%, based on the total weight, of said lens formulation;

    b) placing said lens formulation in a lens mold;

    c) polymerizing- said lens formulation in said mold to form a lens core material having inner and outer surfaces such that said oxyperm polymerizable material and said ionoperm polymerizable material of said lens formulation form separate oxyperm and ionoperm phases;

    said lens core material having an oxygen permeability equal to or greater than 77 barrers;

    d) removing said lens core material from said lens mold;

    e) subjecting said lens core material to a treatment to modify said surfaces of said lens core material, wherein the surface treatment makes said surfaces more biocompatible with the ocular tissue and ocular fluids than said core material alone; and

    f) hydrating the treated lens core material to produce a hydrated extended wear contact lens, wherein the modified surfaces of said lens in conjunction with the high oxygen and ion permeabilities of said core polymeric material allows said hydrated lens to be worn as extended wear lens that is worn for a continuous period of at least 24 hours with corneal swelling of less than about 8%.

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