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Multifocal multizone diffractive ophthalmic lenses

  • US 5,096,285 A
  • Filed: 05/14/1990
  • Issued: 03/17/1992
  • Est. Priority Date: 05/14/1990
  • Status: Expired due to Term
First Claim
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1. A multifocal lens for correcting vision comprising:

  • a basic lens element having a basic lens power and a basic focal length;

    one or more diffractive elements covering one or more zones of said basic lens element arranged as alternate semi-circular area and having a diffractive power,whereby a portion of the light travelling through said lens is focused at said basic focal length by said basic lens power, and another portion of the light travelling through said lens is focused t a different focal length by the combined power of said basic lens element and said diffractive elements.

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