Patent ID: 7429106

Claim:
A method of verifying at least one centering characteristic of an ophthalmic lens provided with engraved markings and mounted on a frame, the method comprising the following steps: a) positioning the ophthalmic lens on a support placed facing a pattern filter; b) using a diffuse light source to illuminate the ophthalmic lens through said pattern filter; c) using a digital camera to pick up the light transmitted by the ophthalmic lens and said pattern filter; d) processing the signal output by the digital camera to determine the positions of the engraved markings of the ophthalmic lens in a stationary frame of reference; e) determining the position of the support in the stationary frame of reference; and f) deducing the value of said centering characteristic from the known position of the support and from the positions of the engraved markings of the ophthalmic lens.