Aspheric multifocal contact lens

Details Aspheric multifocal contact lens Aspheric multifocal contact lens

1993-09-30

1995-07-25

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

G02C 704

Patent

active

054366780

ABSTRACT:
Contact lenses, particularly adapted to correct presbyopic vision, having a multiaspheric back surface having a central zone, a marginal zone, and a peripheral zone, each of the zones being constituted by portions of second-order surfaces of revolution other than spherical, wherein the axial edge lift of the central and marginal zones increase toward the edge of the lens, the transition from the central to the marginal zone is tangential, and the axial edge lift of the peripheral zone decreases toward the edge of the lens.

REFERENCES:
patent: 3482906 (1969-12-01), Volk
patent: 3950082 (1976-04-01), Volk
patent: 4418991 (1983-12-01), Breger
patent: 4525043 (1985-06-01), Bronstein
patent: 4765728 (1988-08-01), Porat
patent: 5050981 (1991-09-01), Roffman
patent: 5349395 (1994-09-01), Stoyan

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