Patent ID: 8678586

Claim:
A method for producing spectacle lenses ( 1 ) from raw lenses ( 10 ) prefabricated in a non-cutting manner; each of said raw lenses having a central axis (M) standing vertically on the raw lens ( 10 ), each of the raw lenses ( 10 ) comprising a convex front side ( 11 ), the front side formed in a rotationally symmetrical manner about the central axis (M) and is not to be reworked, the front side being formed as a first freeform surface, said first freeform surface being composed from a middle axis outward by at least two spherical sections with different radii, said spherical sections tangentially bordering on one another in a sphere transition, each of said spherical sections of the front side, which is arranged close to the middle axis, having a greater spherical radius than every spherical section on the front side at a greater distance from the middle axis, the raw lenses comprising an opposing back side ( 12 ) that is to be reworked with a CNC machine, said front side and opposing back side having in common at least one optical focal point; the method comprising the steps of: calculating a prescription surface ( 13 ) in order to work the opposing back side, the prescription surface being calculated on a basis of a prescription of prescription holder that describes a visual error, and the prescription surface being calculated in such a manner that the reworked back side ( 12 ) forms together with the front side ( 11 ) a prescription lens ( 14 ), and focal points of the prescription lens that correct the visual error of the prescription holder; manufacturing a spectacle glass ( 1 ) with an optical center (Z) through which an eyeglasses wearer looks when looking straight ahead (zero view direction) from the prescription lens ( 14 ) by adaptation to an eyeglass frame ( 2 ); and adapting the prescription lens ( 14 ) in such a manner to the eyeglass frame ( 2 ) that the middle axis (M) of the raw lens ( 10 ) lies outside of the optical center (Z) of the spectacle lens ( 1 ).