G - Physics – 02 – C
Patent
G - Physics
02
C
88/38
G02C 7/02 (2006.01)
Patent
CA 1077315
ABSTRACT OF THE DISCLOSURE Corrected ophthalmic lenses wherein off-axis correction is accomplished with a gradation of index of refraction between optical center and edges of the lenses together with proper control of surface curvature and center thickness. Utilizing regular spherical and/or toric lens surfaces of preselected dioptric values, off-axis corrections of lens aberrations comparable to and improved over those which may be accomplished with aspheric surface design are possible. The relatively complex and expensive processes of applying aspheric corrections to glass lenses can be avoided without sacrifice of oblique correction quality. In this connection, a lens base curve may be chosen so as to minimize astigmatism and a refractive index gradient used to control curvature of field. Still higher degrees of correction are contemplated by using an index gradient along with an aspheric surface and, with careful selection of base curve. Base curve selection may be made with reduction of distortion in mind, asphericity chosen to minimize astigmatism and a refractive index gradient utilized to reduce curvature of field (power error).
271746
American Optical Corporation
Sola International Inc.
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