Method of making hydrogel contact lenses having aspheric front surfaces

  • US 4,909,621 A
  • Filed: 08/17/1987
  • Issued: 03/20/1990
  • Est. Priority Date: 08/17/1987
  • Status: Expired due to Term
First Claim
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1. A contact lens of soft, pliable opthalmic plastic material, said lens when in its dehydrated state having a spherical back surface which in its hydrated state conforms to the corneal curvature of the wearer'"'"'s eye and, when in its dehydrated state, having an aspheric front surface which is a surface of revolution of polar coordinate form, having an asphericity which is a function of (n) {sin(a)} where (a) is the polar angle, and (n) is a radial offset of a tool-controlling circular surface and is equal to at least about 0.013 mm.

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