Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1990-11-08
1993-08-10
Sugarman, Scott J.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
351177, G02C 702
Patent
active
052353575
ABSTRACT:
Plus and minus power ophthalmic spectacle lenses for the correction of distance vision incorporating a convex aspherical front surface are provided. The front surface of the invention is described mathematically as an inside-out conicoid. the inside-out conicoidal surface, when used in conjunction with a concave spherical or toroidal back surface, provides a lens having improved off-axis optical performance and reduced thickness and flatness characteristics relative to prior art lenses of the same back vertex power and refractive index.
REFERENCES:
patent: 3950082 (1976-04-01), Volk
patent: 3960442 (1976-06-01), Davis
patent: 4289387 (1981-09-01), Jalie
"A New Decade of Aspheric Lenses", by Mo Jalie Optician Jan. 12, 1990.
"The Principles of Ophthalmic Lenses", by Mr. M. Jalie The Association of British Dispensing Opticians Chapter 21, Fourth Edition Jan. 1988.
"Aspherical surfaces used to minimize oblique astigmatic error, power error, and distortion of some high positive and negative power ophthalmic lenses", by Milton Katz Applied Optics, vol. 21, No. 16 Aug. 15, 1982.
Whitney Richard B.
Winthrop John T.
American Optical Corporation
Sugarman Scott J.
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