Patent ID: 8805612
Filing Date: 2014-08-12
Classification: G02C

Abstract:
1. A method of calculating local magnification and/or local distortion of a spectacle lens in at least one predetermined or predeterminable viewing direction, the spectacle lens being configured for correcting a refractive deficit of an eye and having at least a first object-side surface and a second eye-side surface, comprising: calculating, by a computer, a course of a main beam for the predetermined or predeterminable viewing direction, which main beam originates from a predetermined or object point and, after refraction by the spectacle lens, passes through a rotation point of the eye, through eye entrance pupils or through an eye principal plane; determining, by the computer, main curvatures and directions of a local wave front associated with the main beam on refraction by the spectacle lens; and calculating, by the computer, a local magnification and/or a local distortion of the spectacle lens from the determined main curvatures and local wave front directions, main beam course data and spectacle lens data.