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Lens manufacturing process

  • US 20020153623A1
  • Filed: 01/24/2002
  • Published: 10/24/2002
  • Est. Priority Date: 01/24/2001
  • Status: Abandoned Application
First Claim
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1. A method for molding an ophthalmic lens comprising:

  • (a) providing a first mold part having a front curve molding surface for the ophthalmic lens;

    (b) providing a second mold part having a back curve molding surface for the ophthalmic lens;

    (c) extruding a melt-processable polymer;

    (d) cutting a sample from the extruded polymer;

    (e) depositing the sample in the first mold part;

    (f) moving the first and the second mold parts together to form a mold cavity between the opposing front curve molding surface and back curve molding surface with the polymer therebetween, the mold cavity defining a shape of an ophthalmic lens having a variable volume between a first volume and a second volume, the second volume being greater than the first volume, wherein the mold parts have sufficiently small clearance such that gas escapes from the mold cavity and none of the polymer escapes from the mold cavity;

    (g) squeezing the mold parts together with a predetermined force; and

    (h) allowing the polymer to solidify and form a lens.

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