Multi-focal diffractive ophthalmic lenses

Details Multi-focal diffractive ophthalmic lenses Multi-focal diffractive ophthalmic lenses

1989-11-21

1992-07-14

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351172, 359565, 359570, 359571, 359575, 623 6, G02C 704, G02C 702, G02B 2744

Patent

active

051297183

ABSTRACT:
An ophthalmic lens exhibiting diffractive power has a plurality of diffractive zones and smooth surfaces. The zones are arranged such that R.sub.0.sup.2 does not equal R.sub.1.sup.2 -R.sub.0.sup.2 where R.sub.0 is the radius of the central zone and R.sub.1 is the radius of the first annular zone.

REFERENCES:
patent: 4070105 (1978-01-01), Marzouk
patent: 4146306 (1979-03-01), Wallach
patent: 4210391 (1980-07-01), Cohan
patent: 4338005 (1982-07-01), Cohan
patent: 4340283 (1982-07-01), Cohan

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