Patent ID: 8366269

Claim:
A method of making a spectacle lens comprising the steps of: providing a prescription for the spectacle lens; providing a material for making the spectacle lens; providing at least two design wavelengths for monochromatic light for computing, with the aid of a numerical sight ray tracing method, a design defining the geometric shape of a spectacle lens for a prescription; computing, with the aid of a sight ray tracing method, respective predesigns, which define a preliminary geometric shape of the spectacle lens for said prescription, for the spectacle lens having a determined refractive index of the material for a corresponding one of said wavelengths; computing the design of the spectacle lens, which defines the final geometric shape of the spectacle lens provided by said prescription, from said predesigns for the spectacle lens for the refractive indices determined from corresponding ones of said wavelengths; computing said design by a mean value formation of said predesigns; and, forming the spectacle lens according to the design.