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Enhanced ophthalmic lens

  • US 5,867,246 A
  • Filed: 01/17/1997
  • Issued: 02/02/1999
  • Est. Priority Date: 10/21/1994
  • Status: Expired due to Term
First Claim
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1. A progressive ophthalmic lens including a lens surface havinga lower viewing zone for near viewing distances providing a predetermined relatively high surface power;

  • said predetermined power being determined by the viewer'"'"'s near prescription (Rx), the horizontal fitting position of the lens normally being determined by the near pupillary distance of the wearer, and the vertical fitting position normally being determined by the vertical frame midpoint;

    an upper viewing zone of relatively lower surface power for intermediate viewing distances; and

    a corridor of relatively low astigmatism extending there between;

    wherein the contours of surface astigmatism of the lens are approximately bilaterally symmetric about a vertical lens meridian as fitted to the wearer.

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