Aspherical spectacle lens

Details Aspherical spectacle lens Aspherical spectacle lens

2006-02-07

2006-02-07

Sugarman, Scott J. (Department: 2873)

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

C351S176000

Reexamination Certificate

active

06994435

ABSTRACT:
There is provided a spectacle lens having an outer surface and an inner surface, one of the outer and inner surfaces being configured to be a rotationally-asymmetrical aspherical surface. When a curvature at a coordinate (h,θ) of the outer surface is represented by C1(h,θ), a curvature at a coordinate (h,θ) of the inner surface is represented by C2(h,θ), and a difference between curvatures of the outer surface and the inner surface at the coordinate (h,θ) is represented by C2-1(h,θ)=C2(h,θ)−C1(h,θ), if C2-1(0,θ)>0, within the ranges of 10 mm≦h[mm]≦20 mm and 30°≦θ[°]≦150° the spectacle lens satisfying a condition (1):in-line-formulae description="In-line Formulae" end="lead"?C2-1(h,θ+180)−C2-1(h,θ)>0,  (1)in-line-formulae description="In-line Formulae" end="tail"?and if C2-1(0,θ)<0, the spectacle lens satisfying a condition (2):in-line-formulae description="In-line Formulae" end="lead"?C2-1(h,θ+180)−C2-1(h,θ)<0.  (2)in-line-formulae description="In-line Formulae" end="tail"?

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