Patent ID: 8651661

Claim:
A method of preparing an ophthalmic lens ( 20 ) for mounting in a surround of an eyeglass frame ( 10 ), the method comprising: an acquisition step of acquiring a first longitudinal profile ( 27 ) of said surround; a blocking step of blocking the ophthalmic lens ( 20 ) in support means ( 31 ); and an edging step of edging the ophthalmic lens ( 20 ) by shaper means ( 32 ), during which the support means ( 31 ) or the shaper means ( 32 ) are controlled in such a manner that the ophthalmic lens ( 20 ) is edged to have an engagement ridge ( 24 ) on its edge face ( 23 ) that is generally profiled with a desired section and that extends along a second longitudinal profile ( 25 ) that is derived from the first longitudinal profile ( 27 ); wherein the method includes a determination step of determining at least one singular portion (Z 1 -Z 5 ) of the second longitudinal profile ( 25 ) as a portion that is situated at less than 5 millimeters from or that contains a singular point (P 1 -P 5 ) at which the second longitudinal profile ( 25 ) presents a radius of curvature that is at a minimum or less than a threshold; and in that during the edging step, the support means ( 31 ) or the shaper means ( 32 ) are controlled in such a manner that the section of the engagement ridge ( 24 ) is reduced in width or height over said singular portion (Z 1 -Z 5 ).