Contact lens having a uniform horizontal thickness profile

  • US 7,134,753 B2
  • Filed: 07/22/2005
  • Issued: 11/14/2006
  • Est. Priority Date: 03/31/2000
  • Status: Expired due to Fees
First Claim
Patent Images

1. A contact lens, comprising:

  • a posterior surface;

    an opposing anterior surface including a vertical meridian, a horizontal meridian, a central optical zone, a second zone circumscribing the optical zone, and a third zone circumscribing the second zone,wherein the second zone has a surface that, in combination with the posterior surface, provides in the second zone of the lens a thickness profile which is characterized (1) by having a lens thickness which increases progressively from the top of the second zone downwardly along the vertical meridian or lines parallel to the vertical meridian until reaching a maximum value at a position between the central optical zone and an inferior edge of the second zone and then decreases to an edge of the third zone, or (2) by being symmetric with respect to the vertical meridian, by having a substantially uniform thickness in a region around the horizontal meridian and by having a thickness which decreases progressively from the region around the horizontal meridian upward to the top of the second zone along the vertical meridian or lines parallel to the vertical meridian.

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