Patent ID: 6945649

Claim:
A method for production of a progressive spectacle lens having at least one progressive surface, in which the at least one progressive surface is calculated taking account of individual data, which includes the cornea/bridge distance, of the spectacle lens, such that, at pronounced parts on a main line including the so-called far reference point, B F , and the near reference point, B N , the spectacle lens has a specific effect which is predetermined by a spectacle prescription, characterized by the following steps: the individual cornea/bridge distance, HSA, for a spectacle frame, which is selected by the spectacle wearer and is matched in advance, is measured, the optimum, individual progression length, L opt , for the spectacle frame which has been matched in advance, which is the distance between the far reference point and the near reference point in the direction of the vertical in the in-use position, is determined by means of the following relationship: L opt =tan(32.3°±1°)*( HSA +13.5 mm)+ d ( B F ,ZK ), where; HSA: cornea/bridge distance d(B F ,ZK): Distance between the far reference point and a centering cross the progressive surface of the spectacle lens is calculated such that the determined individual progression length L opt is obtained, and the spectacle lens is manufactured in accordance with the calculated data.