Clear axis, segmented multifocal ophthalmic lens

Details Clear axis, segmented multifocal ophthalmic lens Clear axis, segmented multifocal ophthalmic lens

1993-10-25

1994-09-20

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351160R, G02C 704

Patent

active

053493966

ABSTRACT:
A multifocal refractive lens to focus light on the retina of the eye. The lens is comprised of a plurality of segments, having different optical powers, at least one for distance vision and another for near. The lens does not require orientation to produce adequate far and near vision and normal stereoscopic effect. One or both of the segments having the optical powers may have aspherical lens surface. The central zone of the lens consists of only one lens segment, providing a clear central axis. Segments of the other optical power border the first segment along a path defined by a semi-circle or hyperbola that extends from one point along the periphery of the adjoining segments to another point along the periphery of the adjoining segments.

REFERENCES:
patent: 4923296 (1990-05-01), Erickson
patent: 5089024 (1992-02-01), Christie et al.
patent: 5173723 (1992-12-01), Volk

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