Method for determining the feasibility of an ophthalmic lens

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, a 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 epsilon 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: formula (I) with formula (II) the value of the derivative of Pi with respect to the jth surface parameter alpha j on the nominal surface and [delta] [alpha]j the value of the jth surface parameter and Ai a combination of terms of order greater or equal to 2 for each Pi.