Patent ID: 9022560
Filing Date: 2015-05-05
Classification: G02C

Abstract:
1. A method for producing a series of base lenses, which cover a predetermined power range, wherein the base lenses are lens blanks, each base lens of the series has a base power, which is different from the base powers of the other base lenses of the series, and each base lens of the series has at least one diffractive base grating, the method comprising: assigning one correction range to each of the base lenses; specifying the base powers of each base lens of the series, wherein the base powers are specified such that the correction ranges of the individual base lenses cover the predetermined power range; and calculating the base grating of each base lens of the series so as to minimize the color fringe in a predetermined region of a spectacle lens manufactured from the base lens and having the specified base power, wherein