Uniform strength ophthalmic lens having a gradient refractive in

Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks

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350413, 350432, 351176, 351177, G02C 702, G02

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active

048568899

ABSTRACT:
A uniform strength ophthalmic lens having a gradient refractive index changing rotational-symmetrically about the optical axis in which the curvature course of at least one of the two surfaces of the ophthalmic lens is selected without consideration of correction of aberration so that the critical thickness of the ophthalmic lens does not exceed a specific value and that the gradient refractive index is change rotational-symmetrically about the optical axis so as to correct the aberration. In this manner, a significant reduction of the critical thickness of the opthalmic lens, i.e., the center thickness is a positive lens and peripheral thickness in a negative lens, is achieved while providing an ophthalmic lens having good image-forming properties.

REFERENCES:
patent: 3486808 (1969-12-01), Hamblen
patent: 3718383 (1973-02-01), Moore
Charman, W. N.; "Gradient Index Optics"; The Ophthalmic Optician; Jan. 31, 1981; pp. 72-84.

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