Ophthalmic machine and method for machining and/or polishing a lens

An ophthalmic machine for machining and/or polishing a lens or plastic blank, comprising at least one machining and/or polishing tool, machining means for machining along a first axis designed to be able to drive said tool, workpiece supporting means on which are placed holding means that are for holding at least one blank in place, which blank has a first face and a second face opposite each other, and means for inverting said blank so as to allow it to be machined on each of said faces, said machining means being designed so as to be able to transfer marking means that can be recognized or identified by monitoring means or else designed so as to be able to reposition said blank on said holding means after the opposite face has been machined, said device comprising a main platform bearing secondary platforms themselves bearing carriages oriented in a direct orthogonal Cartesian reference system along axes, the latter axis being parallel or coincident with said first axis, said axes and defining a horizontal plane, said axes and defining a first vertical plane and said axes and defining a second vertical plane, said workpiece supporting means comprising at least one workpiece holder having an oblique bearing surface inclined at an angle to said axis in said plane and at an angle to said axis in said plane, said bearing surface bearing said means for holding a blank, said device thus being designed so as to be able to carry out a machining operation along said first axis with always increasing Z or else with always decreasing Z over the entire sequence of machining one of the faces of said blank, and said angles and each being between 20° and 45°.