Patent ID: 8540367
Filing Date: 2013-09-24
Classification: B29D,G02C

Abstract:
1. A method of selecting a semi-finished ophthalmic lens according to a given spectacle frame comprising the steps of: providing, at a processor, the spectacle frame front face base data; providing, at the processor, a list of semi-finished ophthalmic lenses with a plurality of front face bases; and selecting, by the processor, from the list of semi-finished ophthalmic lenses a semi-finished ophthalmic lens whose front base is the closest to the front base of the spectacle frame, wherein the semi-finished lens is selected such that the average curvature of the front face of the semi-finished lens, differs by less than 0.5 Diopter from the average curvature of the front face of the spectacle frame, with the average curvature of the front face of the semi-finished lens and the average curvature of the front face of the spectacle frame both being expressed in terms of Diopters for an index of refraction of 1.53.