Multispheric contact lens

Details Multispheric contact lens Multispheric contact lens

1997-01-27

1998-08-25

Epps, Georgia Y.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

G02C 704

Patent

active

057988161

ABSTRACT:
Multispheric contact lenses have a posterior surface including a central, concave spherical optical zone and at least two concave spherical curves peripheral to the central concave optical zone. The lens includes a fillet convex curve connecting the central zone and the first peripheral curve, and fillet convex curves connecting adjacent peripheral concave curves, wherein each junction of a fillet convex curve with a concave spherical curve is tangential. The lenses have an anterior surface including one or more convex spherical curves.

REFERENCES:
patent: 2544246 (1951-03-01), Butterfield
patent: 3937566 (1976-02-01), Townsley
patent: 4640595 (1987-02-01), Volk
patent: 4883350 (1989-11-01), Muckenhirn
patent: 4890913 (1990-01-01), De Carle
patent: 5270744 (1993-12-01), Portney

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