Prescription lens and method of making same

  • US 8,002,404 B2
  • Filed: 05/22/2009
  • Issued: 08/23/2011
  • Est. Priority Date: 05/22/2009
  • Status: Active Grant
First Claim
Patent Images

1. A prescription lens fitted for an eyeglass frame, the lens having:

  • (a) a spherical front lens surface with a front base curve configured to match a curve profile of the frame; and

    (b) a rear lens surface curved such that the lens has a central optical zone, an annular intermediate zone surrounding the central optical zone, and an annular edge zone surrounding the intermediate zone;

    wherein the rear lens surface in the central optical zone has a curvature such that the central optical zone of the lens has a lens power substantially equal to a prescription for a wearer of the lens, the rear lens surface in the edge zone has a substantially flat profile in a direction substantially perpendicular to an optical axis of the prescription lens, and the rear lens surface in the intermediate zone has a curvature that smoothly bridges the curvature of the rear lens surface in the central optical zone and the flat profile of the rear lens surface in the edge zone.

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