Multifocal contact lens

Details Multifocal contact lens Multifocal contact lens

1994-09-16

1997-04-08

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

G02C 704

Patent

active

056192894

ABSTRACT:
A multifocal contact lens customized for a patient has, in accordance with the present invention, an anterior side with a power curve defined in part by a (i) central aspheric surface, (ii) an inner annular surface contiguous with the central aspheric surface, (iii) a second annular surface contiguous along a radially inner periphery with the inner annular aspheric surface, and (iv) an outer annular surface contiguous along a radially inner periphery with the second annular aspheric surface. Each of the annular surfaces is concentric or coaxial with the central aspheric surface. The central aspheric surface corresponds to a distance vision correction zone. The inner annular surface is an aspheric surface corresponding to a progressive add zone with a standard eccentricity between approximately -1.5 and approximately -5.0. The second annular surface corresponds to a near vision correction zone, and the outer annular surface corresponds to a distant vision correction zone.

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