Eyeglass lens

Details Eyeglass lens Eyeglass lens

1995-12-22

1998-06-16

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351176, G02C 702

Patent

active

057679398

ABSTRACT:
An eyeglass lens of the present invention has a surface which is a refracting surface arranged such that two coordinate axes X and Y are set to contact with the refracting surface at a determined point thereon while directions of the coordinate axes and an XY plane including the two axes are determined, that a perpendicular line is dropped toward the XY plane from an arbitrary point on the refracting surface, and then X, Y coordinates of an intersecting point between the perpendicular line and the XY plane are denoted by x and y, respectively, and the length of the perpendicular line by z, and that a value of z is expressed as follows: ##EQU1## where r.sup.2 =x.sup.2 +y.sup.2 ; C.sub.x, C.sub.y, K.sub.x, K.sub.y, A.sub.n,m,j are constants to define the shape of lens;

REFERENCES:
patent: 5479220 (1995-12-01), Komatsu et al.
Patent Abstracts of Japan, vol. 13, No. 250 (P-882) 12 Jun. 1989.
Katz, M. "Aspherical Surfaces Used to Minimize . . . " Applied Optics, vol. 21, No. 16, Aug. 1982, N.Y. pp. 2982-2990.

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