Aspheric multifocal contact lens having concentric front surface

Details Aspheric multifocal contact lens having concentric front surface Aspheric multifocal contact lens having concentric front surface

1996-11-22

1998-11-10

Font, Frank G.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351160H, 351160R, G02V 704

Patent

active

058351876

ABSTRACT:
The present invention relates to a multifocal contact lens having an edge, a front and back side and a series of concentrically arranged zones comprising central zone, a marginal zone and a peripheral zone. Each of the zones on the back side of the lens is defined by a second-order surface of revolution other than spherical. The front side of the lens comprises multiple spherical surfaces for providing increasing power correction from the central zone toward the peripheral zone.

REFERENCES:
patent: 4765728 (1988-08-01), Porat et al.
patent: 4838674 (1989-06-01), Dufour
patent: 4861152 (1989-08-01), Vinzia et al.
patent: 4890913 (1990-01-01), De Carle
patent: 5125729 (1992-06-01), Mercure
patent: 5166710 (1992-11-01), Hofer et al.
patent: 5181053 (1993-01-01), Brown
patent: 5349395 (1994-09-01), Stoyan
patent: 5436678 (1995-07-01), Carroll
patent: 5507979 (1996-04-01), Roffman et al.

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