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Progressive addition lenses with an additional zone

  • US 6,886,938 B1
  • Filed: 10/29/2003
  • Issued: 05/03/2005
  • Est. Priority Date: 10/29/2003
  • Status: Expired due to Term
First Claim
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1. A multifocal lens, comprising:

  • a.) a distance vision power zone;

    b.) a near vision power zone comprising an add power;

    c.) an intermediate vision power zone between the distance and near vision power zones; and

    d.) a fourth zone located inferior to the near vision power zone, wherein the fourth zone has a constant power that is within about 20 to about 80% of the add power.

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