Multi-focal diffractive ophthalmic lenses

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

1991-02-11

1992-05-26

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

359565, 359569, 359570, 359571, 623 5, 623 6, G02C 704, G02B 2742, A61F 214, A61F 216

Patent

active

051161117

ABSTRACT:
A multifocal ophthalmic lens has diffractive power produced by a plurality of concentric zones. The zones have radii that meet the condition

REFERENCES:
patent: 4340283 (1982-07-01), Cohen

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