Bifocal contact lens

Details Bifocal contact lens Bifocal contact lens

1983-05-06

1986-06-10

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351177, G02C 704, G02C 706

Patent

active

045939810

ABSTRACT:
A bifocal contact lens having a curved anterior (outside) surface and a curved posterior (inside) surface is formed from a lens blank. The lens corrects for near vision, for example, of a presbyope, by a full-hemisphere spherical depression (seg) in the center of the posterior surface which becomes filled with tear liquid. The ring-like peripheral area, beyond the depression, at the posterior surface, has a curvature which matches the cornea of the wearer and permits a gap for tear liquid flow, the curvature of the peripheral area having a larger radius than the radius of the depression. The ring-like zone formed by the junction of the depression and the peripheral area is smoothed by a velveteen cloth polishing operation to form a transparent curved zone which permits near, far and intermediate distance viewing by the wearer through the center of the lens and without movement of the lens on the cornea.

REFERENCES:
patent: Re25286 (1962-11-01), De Carle
patent: 4418991 (1983-12-01), Breger
patent: 4525043 (1985-06-01), Bronstein

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