Concentric bifocal contact lens with two distance power regions

Details Concentric bifocal contact lens with two distance power regions Concentric bifocal contact lens with two distance power regions

1985-11-19

1988-06-21

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351177, G02C 704

Patent

active

047521236

ABSTRACT:
A concentric bifocal contact lens is disclosed. The lens has a first distance power correction region of circular periphery in the central portion thereof, surrounded in succession by a concentric near power correction annular region and a concentric second distance power correction annular region. Under bright conditions, when the pupil of the eye is small, the central distance power region is helpful in achieving good distance vision.

REFERENCES:
patent: 3034403 (1962-05-01), Neefe
patent: 4162122 (1979-07-01), Cohen
patent: 4210391 (1980-07-01), Cohen
patent: 4262370 (1981-04-01), Hartstein
patent: 4466705 (1984-08-01), Michelson
patent: 4573775 (1986-03-01), Bayshore
patent: 4580882 (1986-04-01), Nuchman et al.
patent: 4636049 (1987-01-01), Blaker
patent: 4636211 (1987-01-01), Nielsen et al.
patent: 4642112 (1987-02-01), Freeman

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