Multifocal contact lens

Details Multifocal contact lens Multifocal contact lens

1993-08-04

1996-01-09

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

G02C 704

Patent

active

054833043

ABSTRACT:
A multifocal contact lens, having a rear surface configured to float on a tear film covering the user's cornea, a front surface comprised of at least two contiguous surface segments, an upper surface segment optically configured to serve for distance vision and a lower surface segment optically configured to serve for near vision. In at least one peripheral zone of the lens there is provided at least one recess constituting a preferred escape aperture for parts of the tear film displaced when the contact lens slides down the user's cornea, to the effect of substantially preventing rotation of the contact tens during lens translation.

REFERENCES:
patent: 3279878 (1966-10-01), Long
patent: 4211476 (1980-07-01), Brummel et al.
patent: 4268133 (1981-05-01), Fischer et al.
patent: 4353849 (1982-10-01), Lewison
patent: 4854089 (1989-08-01), Morales
Tajiri, Akira; "Dimple Contact Lenses"; American Journal of Optometry & Archives; vol. 42, No. 4; Apr. 1965; pp. 248-249.

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