Patent ID: 6070980
Filing Date: 2000-06-06
Classification: G02B,G02C

Abstract:
A spectacle lens comprising:a diffractive structure for producing diffraction to correct transverse chromatic aberration that is caused by a macroscopic surface shape of said spectacle lens;wherein said diffractive structure comprises a series of rings formed integral with said spectacle lens; andwherein providing that the Abbe number of a material of which said spectacle lens is made and the prism power at any one point on said series of rings within a radius of at least 30 mm about the geometric center of said spectacle lens are represented by .nu. and P (prism diopter), respectively, a pitch p(mm) of said series of rings satisfies the following condition (1):p<0.04.nu./.vertline.P.vertline. (1).