Patent ID: 8209046

Claim:
A preparation device ( 1 ) for preparing an ophthalmic lens (L 1 , L 2 ) to be machined, the device comprising: a support ( 100 ) suitable for holding said ophthalmic lens (L 1 , L 2 ); blocking means ( 400 ) including at least one blocking accessory ( 450 ) and a manipulator arm ( 401 ) for manipulating said blocking accessory ( 450 ); an acquisition device ( 200 ) suitable for acquiring an image ( 601 ) of the ophthalmic lens (L 1 , L 2 ) held by the support ( 100 ); and processor means ( 700 ) suitable firstly for deducing an optical frame of reference of the ophthalmic lens (L 1 , L 2 ) from the image ( 601 ) acquired by the acquisition device ( 200 ), and secondly for controlling the position of at least one of the manipulator arm ( 401 ) and the support ( 100 ) to apply said blocking accessory ( 450 ) against the ophthalmic lens (L 1 , L 2 ) in a given blocking position (P 1 ) that depends on the deduced optical frame of reference; wherein at least one of the blocking means ( 400 ) and the support ( 100 ) includes at least one marker element ( 101 , 111 , 121 , 411 , 412 , 461 ), and in that the processor means ( 700 ) are adapted to identify the position of said marker element ( 101 , 111 , 121 , 411 , 412 , 461 ) in an image ( 601 ) acquired by the acquisition device ( 200 ) and in which there appears an image of said marker element ( 101 , 111 , 121 , 411 , 412 , 461 ).