Patent ID: 8215210

Claim:
A method of machining a face ( 3 ) of an ophthalmic lens ( 1 ) comprising: a main machining step during which the position of a machining tool ( 8 ) is synchronized with the angular position of the ophthalmic lens ( 1 ) driven in rotation about a rotation axis ( 4 ) transverse to said face ( 3 ) to machine on said face a surface that is asymmetrical with respect to the rotation axis ( 4 ) of the ophthalmic lens ( 1 ); and a complementary step of machining a recess ( 22 ) around the rotation axis ( 4 ) of the ophthalmic lens ( 1 ), said complementary machining step performed before said main machining step, the main machining step performed so that without the complementary machining step, upon the machining tool approaching the rotation axis of the ophthalmic lens, a residual volume of material is removed by forcing an intermittent inverse operation of the machining tool, the complementary machining step performed so that the recess is made at the location of the residual volume, wherein the tool for machining the recess ( 22 ) is in contact with the ophthalmic lens ( 1 ) during only an angular portion of the rotation of the ophthalmic lens ( 1 ).