Multifocal ocular lens having intermediate region with continuou

Details Multifocal ocular lens having intermediate region with continuou Multifocal ocular lens having intermediate region with continuou

1999-03-09

2000-02-29

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351177, G02C 704

Patent

active

060300779

ABSTRACT:
A multifocal ocular lens having a vision correction area which consists of a central, an intermediate, and an outer vision correction region having respective different values of an optical power, and which has an optical axis with which centers of the central and outer vision correction regions are aligned, the central and outer vision correction regions having respectively determined first and second mutually different values of the optical power, wherein the optical power of the intermediate region is represented by a combination of a first and a second quadratic curve connected to each other at a point of inflection which corresponds to a radial position of a boundary between the inner and outer sections, and which corresponds to a desired third value of the optical power between the first and second values, or the optical power of the intermediate region is represented by one polynomial equation whose degree is not smaller than 2 and continuously changes from the first value to the second value with an increase in a radial distance from the optical axis.

REFERENCES:
patent: 4514061 (1985-04-01), Winthrop
patent: 4580882 (1986-04-01), Nuchman et al.
patent: 4786160 (1988-11-01), Furter
patent: 5270745 (1993-12-01), Pedrono

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