Patent ID: 7144110

Claim:
A double progressive spectacle lens having a prefabricated progressive surface and a second progressive surface for correcting a spherical ametropia or a cylindrical ametropia, wherein one of the progressive surfaces is formed on the front surface of the lens and the other progressive surface is formed on the rear surface of the lens; the surface properties of the second progressive surface in the vicinity of the principal line of sight are asymmetric; the asymmetry is determined by the symmetry factor S A ; the symmetry factor S A is determined in relation to the value A by the ratio of the smaller to the larger horizontal distance between the principal line of sight and locations on both sides of the principal line of sight at which the surface astigmatism in a horizontal section reaches the value A in diopters, and the symmetry factor S 0.3 of the second progressive surface is smaller than 0.8 in at least one horizontal section.