Patent ID: 8079705
Filing Date: 2011-12-20
Classification: G02C

Abstract:
1. Method for the production of an ophthalmic element for correcting ametropia, capable of correcting the foveal vision and the peripheral vision of a wearer of said element, comprising the following steps: /1/ characterizing a relative amplitudes of respective movements of the wearer's eyes and head; /2/ determining ametropia corrections respectively for the foveal vision and the peripheral vision of the wearer; /3/ determining an optical power distribution of the ophthalmic element along a face of said element, which produces the ametropia correction for the foveal vision in a central zone of the ophthalmic element, and which varies outside the central zone towards an optical power value corresponding to the ametropia correction for the peripheral vision; and /4/ producing the ophthalmic element so as to obtain said optical power distribution, wherein step /3/ comprises determining the central zone of the ophthalmic element, which central zone produces the correction of the foveal vision, with a size for said central zone increasing as a function of the relative amplitude of the wearer's eye movements with respect to the wearer's head movements, step /1/ comprises a gain calculation for a test of “head/eye” movement coordination carried out for the wearer, said gain being an increasing function of a quotient of an angular displacement of the wearer's head (α the size of the central zone of the ophthalmic element in which the ametropia correction is produced for the wearer's foveal vision is determined in step /3/ via a value for the optical power of the ophthalmic element for a point located outside the central zone of said element, said optical power value at the point of the ophthalmic element located outside the central zone being itself determined as a function of the gain calculated for the wearer.