Multifocal artificial ocular lens with a transparency varying wi

Details Multifocal artificial ocular lens with a transparency varying wi Multifocal artificial ocular lens with a transparency varying wi

1996-12-30

2000-01-25

Epps, Georgia

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351163, 351164, 623 6, G02C 704, G02C 710, A61F 216

Patent

active

060171219

ABSTRACT:
A multifocal artificial ocular lens has at least two corrective areas, namely a near vision area to correct near vision and a distance vision area to correct distance vision. The transparency of the lens varies in inverse proportion to its illumination. A photochromic substance is incorporated into the material of the lens, which improves optical performance. Applications include central near vision contact lenses.

REFERENCES:
patent: Re33477 (1990-12-01), Loshaek
patent: 3507552 (1970-04-01), Scott
patent: 3950082 (1976-04-01), Volk
patent: 4304895 (1981-12-01), Loshaek
patent: 4636049 (1987-01-01), Blaker
patent: 4681412 (1987-07-01), Lemelson
patent: 4851471 (1989-07-01), Maltman
patent: 4913544 (1990-04-01), Rickwood
patent: 5108427 (1992-04-01), Majercik
patent: 5260727 (1993-11-01), Oksman et al.
patent: 5757459 (1998-05-01), Bhalakia et al.

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