Plano-aspheric spectacle lens

Details Plano-aspheric spectacle lens Plano-aspheric spectacle lens

1997-02-10

1998-11-10

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351163, G02C 702

Patent

active

058351868

ABSTRACT:
A plano-aspheric spectacle lens that is particularly beneficial under night and low-light conditions and/or by those who have had refractive surgery. A first refractive surface of the lens, preferably the back or concave side, has an aspheric surface with a power of from about minus 0.20 to minus 0.37 diopters and a central, generally circular, spherical area having no power and a diameter of from about 1 to 5 mm. If any corrections are required for eye anomalies such as refractive error, astigmatism or the like, those corrections are applied to the lens surface opposite the plano-aspheric surface, preferably the back or concave surface.

REFERENCES:
patent: 5054904 (1991-10-01), Bristol

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