Method of designing aspherical spectacle lens

Details Method of designing aspherical spectacle lens Method of designing aspherical spectacle lens

2006-10-17

2006-10-17

Sugarman, Scott J. (Department: 2873)

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

C351S159000

Reexamination Certificate

active

07121664

ABSTRACT:
A method of designing a spectacle lens having a front surface and a back surface is provided. At least one of the front and back surfaces is formed as a rotationally asymmetrical aspherical surface. The method includes the steps of selecting a plurality of cross-sections of the spectacle lens respectively defined in a plurality of planes each of which includes a reference axis passing through the front and back surfaces at a point substantially equal to a center of an outer diameter of the spectacle lens, each of the plurality of cross-sections having one side coinciding with the reference axis, designing each of shapes of the plurality of cross-sections so that predetermined optical performance is optimized for each of the shapes of the plurality of cross-sections, and interpolating a characteristic amount regarding intermediate points on the rotationally asymmetrical aspherical surface between the shapes of the plurality of cross-sections using a characteristic amount of each of the shapes of the plurality of cross-sections.

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U.S. Appl. No. 10/790,541, filed on Mar. 2, 2004, to Shirayanagi.

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