Importance

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Abstract

A method implemented by computer means of modifying an initial dioptric function of an initial ophthalmic lens surface, for manufacturing an ophthalmic lens, the method comprising:

an initial surface providing step (S1), during which an initial surface Sini associated with a first coordinate system is provided, said initial surface Sini comprising a plurality of surface points P1, each surface point P1 having a mean sphere Sph(P1) and a cylinder Cyl(P1), said initial surface Sini providing said initial dioptric function,a modifying surface selection step (S2), during which a number n of nonzero modifying surfaces Smod1, . . . , Smodn is selected, said modifying surfaces Smod1, . . . , Smodn being associated with a second coordinate system, the modifying surface Smodi comprising a plurality of surface points Pi1, . . . Pij, . . . , Pimi, each surface point Pij having a mean sphere Sph(Pij) and a cylinder Cyl(Pij), n, i, j, mi being integers with n≥1, 1≤i≤n, 1≤j≤mi and mi≥1,an orientation step (S3), during which the relative position and orientation of the first coordinate system and the second coordinate system is determined,a combining step (S4), during which the initial surface Sini and the n modifying surfaces are combined to obtain a functionalized ophthalmic lens surface according to the expression:Sfunc=Sini+Σi=1i=nalphai·Smodi wherein the normalized sphere standard deviation of the normalized sphere values Sph′Smodi of a normalized modifying surface SNmodi is smaller than or equal to 0.2, with:the normalized modifying surface SNmodi corresponding to the modifying surface Smodi to which the best sphero-toric surface has been subtracted, andthe normalized sphere values over the normalized modifying surface SNmodi at a point Pij of Smodi having the coordinate (x,y,z) being:

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First Claim