Uniform strength ophthalmic lens having a gradient refractive in

Details Uniform strength ophthalmic lens having a gradient refractive in Uniform strength ophthalmic lens having a gradient refractive in

1987-05-20

1989-08-15

Arnold, Bruce Y.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

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

Patent

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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