Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1984-03-08
1986-03-04
Corbin, John K.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
351168, 351177, G02C 702, G02C 706
Patent
active
045737770
ABSTRACT:
The present invention provides a spectacle lens blank for an aphakic eye and which is adapted to be worn in front of the eye by patients following extra capsular surgery. The lens blank includes a lens body having a posterior surface and an aspherical anterior surface in which the lens power decreases from the center and towards the edges of the lens blank. The lens blank also includes a flat top bifocal lens segment having an optical center on the same vertical center line as the lens body but in which the flat top is spaced downwardly from the optical center of the lens body by one to four millimeters and preferably by substantially 3 millimeters. In use, the lens blank can be trimmed to fit eyeglass frames to produce either a left lens or right lens.
REFERENCES:
patent: 2518099 (1950-08-01), Tillyer
patent: 2796000 (1957-06-01), Beasley
patent: 2923201 (1960-02-01), Beasley
patent: 3169247 (1965-02-01), Davis et al.
patent: 3781097 (1973-12-01), Bechtold
patent: 3950082 (1976-04-01), Volk
patent: 4073578 (1978-02-01), Welsh
patent: 4181409 (1980-01-01), Whitney et al.
patent: 4185897 (1980-01-01), Frieder
Tillyer Topics; American Optical advert.; Optometric Weekly; Nov. 9, 1972; p. 5.
Armorlite advert., "Flat Top Aspheric Lenticular"; American Journal of Ophthalmology; vol. 64, No. 6; Dec. 1967, p. 57.
Corbin John K.
Sugarman Scott J.
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