A METHOD OF MANUFACTURING A SPECTACLE LENS PROVIDING AN ASTIGMATIC CORRECTION AND SPECTACLES INCLUDING SUCH SPECTACLE LENS

摘要

A method of manufacturing a spectacle lens providing at least an astigmatic correction comprises: measuring a direction of an axis of an astigmatism of an eye for each of at least three different directions of gaze of the eye; determining a position of the spectacle lens relative to the eye; and computing a shape of a surface of the spectacle lens based on the determined position of the spectacle lens relative to the eye and the at least three measured directions of the axis of the astigmatism. Herein, a primary orientation of the eye can be determined based on the at least three measured directions of the axis of the astigmatism, wherein the shape of the surface of the spectacle lens is calculated based on the determined position of the spectacle lens relative to the eye and by applying Listing's Law based on the determined primary orientation of the eye.