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Multifocal lens designs with intermediate optical powers

  • US 5,682,223 A
  • Filed: 05/04/1995
  • Issued: 10/28/1997
  • Est. Priority Date: 05/04/1995
  • Status: Expired due to Term
First Claim
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1. A multifocus, concentric annular ring lens, comprising:

  • a. said lens having a front surface and an opposite back surface, wherein one of the front and back surfaces defines a central area comprising a circular disc having a spherical surface corresponding to a basic prescriptive spherical distance optical power;

    b. a plurality of annular rings surrounding the central area and having alternating spherical near optical powers and spherical distance optical powers;

    c. at least one intermediate optical power annular ring, located in the outer region of the lens optic zone, having an intermediate optical power, intermediate to the distance optical power and the near optical power, to provide visual acuity at intermediate distances; and

    d. the widths of individual annular rings are different to generate a power profile which varies to generate different ratios of distance optical power to intermediate and near optical power with increasing distance from the center of the lens.

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