Contact lens

Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks

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Details

351177, G02C 704

Patent

active

058808094

ABSTRACT:
A contact lens for use with an asymmetric aspherical cornea. The lens includes an anterior surface, a posterior surface and a base. The posterior and anterior surfaces each include a center optical portion and an outer peripheral corneal portion. The posterior surface is divided into a plurality of local surface segments by a plurality of radially extending boundaries that originate from a common center point on the posterior surface of the lens. Each of the local surface segments conforms to the shape of a corresponding local surface portion of the cornea that lies under the respective lens local surface segment when the lens is worn on the eye.

REFERENCES:
patent: 1921972 (1933-06-01), Fertsch
patent: 2196066 (1940-03-01), Feinbloom
patent: 5173723 (1992-12-01), Volk
patent: 5240553 (1993-08-01), Jones
patent: 5347326 (1994-09-01), Volk
patent: 5428412 (1995-06-01), Stoyan

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