Patent ID: 6382789
Filing Date: 2002-05-07
Classification: G02C

Abstract:
A method for determining, by optimization, an ophthtalmic lens for a spectacle wearer for whom an astigmatism has been prescribed, comprising the steps of:selecting a starting lens and defining a working lens to be equal to the starting lens; selecting a reference lens adapted for a wearer for whom no astignatism was prescribed; modifying the working lens, in order to minimize, in a plurality of directions of glance and in a reference frame associated with the eye: a difference in modulus between residual astigmatism of said working lens and astigmatism of the reference lens; residual astigmatism being defined as the difference between an astigmatism prescribed and astigmatism generated by the working lens in the reference frame associated with the eye, and for each direction of glance.