Abstract: Method for determining the values of a set of n optical parameters (P1, P2, . . . , Pn) 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 (?1, ?2, . . .

Abstract: Method for determining the feasibility of an ophthalmic lens by an ophthalmic lens manufacturing process comprising: an ophthalmic lens data providing step, a set of surface parameters providing step, an optical parameters providing step during which a set of n optical parameters (P1, P2, . . . , Pn) is provided, n being an integer greater than or equal to 1, each optical parameter Pi being provided with a tolerance value ?i, —a feasibility check determining step, during which the feasibility of the ophthalmic lens by the ophthalmic lens manufacturing process is determined by determining if for i from 1 to n: - ? i ? [ ? j = 1 m ? ( ? P i ? ? j ) 0 × ? ? ? ? j ] + A i ? ? i with ? ? ( ? P i ? ? j ) 0 the value of the derivative of Pi with respect to the jth surface parameter ?j on the nominal surface and ??j the value of the jth surface parameter and Ai a combination of terms of order greater or equal to 2 for each Pi.

Abstract: Method for determining the values of a set of n optical parameters (P1, P2, . . . , Pn) 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 (?1, ?2, . . .

Abstract: 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.

Abstract: 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.