Essilor International (compagnie Generale D'optique)

Essilor International

Daniel Steigelman

Pascal Allione

Jean-Pierre Chauveau

Alain Chansavoir

Xavier Lippens

Jean-François Cailloux

Isabelle Lavrador

Philippe Larue

Loïc Kabelaan

Method for determining the values of a set of n optical parameters (P, P, . . . , P) of an ophthalmic lens, n being an integer greater than or equal to 1, the method comprising: an nominal ophthalmic lens data providing step, an ophthalmic lens providing step, an optical surface measuring step, a surface errors determining step during which a set of m surface error parameters (&#x3b1;, &#x3b1;, . . . , &#x3b1;) is determined, m being an integer greater than or equal to 1, an optical parameter determining step during which each optical parameter of the set of optical parameters is determined by: with Pthe value of the ith optical parameter of the manufactured optical lens, Pthe value of the ith optical parameter of the nominal optical lens, the value of the derivative of Pwith respect to the jth surface error parameter &#x3b1;on the nominal surface and &#x394;&#x3b1;the value of the jth surface error parameter, and Aa combination of terms of order greater or equal to 2 for each P.

Method of determining optical parameters of an ophthalmic lens

A process for controlling a lens manufacturing process comprising the steps of: a) manufacturing a master lens according to a manufacturing process using a manufacturing device, b) measuring by using at least a measuring device at least one parameter of the master lens of step a), c) recording the value of the parameter, d) repeating regularly step a) to c) and checking the evolution of the parameter over time, wherein the evolution of at least one parameter of the manufacturing device used during the lens manufacturing process is checked over time and the evolution over time of at least one parameter of the master lens is related with the evolution over time of the at least one parameter of the manufacturing device.

Process for controlling a lens manufacturing process

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Charenton le Pont, France

Daniel Steigelman