Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1990-01-29
1991-06-04
Sugarman, Scott J.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
351161, 351176, G02C 704
Patent
active
050208985
ABSTRACT:
A contact lens for correcting astigmatism. The front surface has a central optical zone and an outer carrier having two points of maximum thickness located at an oblique angle of about 110.degree. to 130.degree. as measured from the vertical axis of the lens. The anterior surface of the lens is symmetrical about its vertical axis. The carrier tapers from the points of maximum thickness to thin portions at the top and bottom of the lens.
The rear surface of the lens has an outer spherical base curve zone, an inner toric zone, and an intermediate transition zone having thickness that gradually increase from the base curve zone to the toric zone. By making the radius of the base curve zone substantially equal to that of the toric zone's major meridian, a thinner, more comfortable lens is obtained.
REFERENCES:
patent: 3503942 (1970-03-01), Seiderman
patent: 3639524 (1972-02-01), Seiderman
patent: 4084890 (1978-04-01), Baron
patent: 4095878 (1978-06-01), Fanti
patent: 4324461 (1982-04-01), Salvatori
patent: 4405773 (1983-09-01), Loshaek et al.
Durasoft 2 Optifit Toric Lens, on sale in the U.S.A.; Beginning Sep. 2, 1988 and brochure for same copyright 1988.
Lee, Jr. Warrick E.
Schering Corporation
Sugarman Scott J.
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