Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1988-08-12
1989-05-16
Corbin, John K.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
35016222, 623 4, 623 5, 623 6, G02C 704, G02B 518, A61F 214, A61F 216
Patent
active
048304816
ABSTRACT:
A multifocal ophthalmic lens has a plurality of concentric diffractive zones with adjacent zones separated by steps having predetermined heights. Each step has an outer corner and each outer corner has a radius of curvature equal to at least one half the height of the step associated therewith.
REFERENCES:
patent: 4162122 (1979-07-01), Cohen
patent: 4210391 (1980-07-01), Cohen
patent: 4338005 (1982-07-01), Cohen
patent: 4340283 (1982-07-01), Cohen
patent: 4704016 (1987-11-01), DeCarla
Futhey John A.
Isaacson William B.
Neby Ricky L.
Buckingham Stephen W.
Corbin John K.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Sell Donald M.
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