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Progressive addition power lens

  • US 20050012895A1
  • Filed: 08/17/2004
  • Published: 01/20/2005
  • Est. Priority Date: 05/31/2002
  • Status: Active Grant
First Claim
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1. A progressive lens comprising a surface having a variable height and including a distance area and a reading area, wherein mean power over the lens surface varies according to a set of curves forming iso-mean power contours on the lens surface and a contour defining an area of constant mean power in the distance area is an ellipse with a ratio of major axis to minor axis in the range of about 1.1 to 3.0.

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