Patent ID: 8560285

Claim:
A computer-implemented method for producing or calculating a design for a progressive spectacle lens with an addition Add, wherein the design comprises a desired astigmatism distribution A Add (u, y) for the addition Add, the method comprising: setting a starting design including specifications for a course of a principal line, and a starting desired astigmatism distribution A Add B (u, y) for a specified base addition Add B , wherein Add B ≠ Add; and calculating, using a computer, the desired astigmatism distribution A Add (u, y) for the addition Add by a transformation of the starting desired astigmatism distribution A Add B (u, y), wherein the transformation of the starting desired astigmatism distribution A Add B (u, y) comprises a multiplication sA Add B (u, y) of the starting desired astigmatism distribution A Add B (u, y) by a scaling factor s, wherein s = t ⁢ Add Add B , t designates a factor which is a function t=t(Add, F, Add B ) of the addition Add, a distance portion power F and the specified base addition Add B , wherein t=1 holds true for Add=Add B , x designates a horizontal coordinate, y designates a vertical coordinate, and u designates a horizontal distance of a point (x, y) from the principal line; and wherein u=0 holds true on the principal line.