Lens for prebyopia free from short distance and intermediate...

Details Lens for prebyopia free from short distance and intermediate... Lens for prebyopia free from short distance and intermediate...

G - Physics

02

C

G02C 7/02 (2006.01)

Patent

CA 2043038

ABSTRACT OF THE DISCLOSURE This invention relates to a lens for presbyopia free from short distance and intermediate distance aberration for use in correcting an old-age eyesight. In the lens for presbyopia with a front lens face having a smaller radius of curvature than a rear lens face, a lens face has a refractive index successively corrected as the lens face extends radially outwardly away from a geometric center of the lens so that lateral magnifications for all principal rays always equal a lateral magnification for a paraxial range. This construction is entirely free from distortional aberration, and secures a greatly enlarged range of distinct vision.

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