Multi-focal diffractive ophthalmic lenses

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

1991-02-11

1991-12-31

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

35016216, 35016222, 350452, 351161, 623 5, 623 6, 385 24, 385 54, 359742, G02C 706, G02C 704, G02B 518, G02B 2744

Patent

active

050766848

ABSTRACT:
A multifocal ophthalmic lens has diffractive power produced by a plurality of concentric zones. The zones have radii that meet the condition R.sub.0.sup.2 <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: 4210391 (1980-07-01), Cohen
patent: 4338005 (1982-07-01), Cohen
patent: 4340283 (1982-07-01), Cohen
patent: 4881804 (1989-11-01), Cohen
patent: 4881805 (1989-11-01), Cohen

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