Mandrel for use in the machining of ophthalmic lenses

A kit of parts comprising:

• a mandrel for holding an ophthalmic lens member blank during machining, the mandrel comprising
• a front surface for receiving said ophthalmic lens member blank to be machined,
• a rear surface opposite the front surface, and
• one or more through-holes extending between the front and rear surfaces, such that, in use, wax applied to the rear surface contacts said ophthalmic lens member blank received on the front surface via said one or more through-holes, wherein the mandrel comprises a stem for mounting the mandrel on a machine tool and a flange extending radially from the stem, the flange comprising part of the front surface, part of the rear surface, and the one or more through-holes, wherein the front surface of the mandrel comprises a central optic zone and an annular peripheral zone, and said one or more through-holes are located in the peripheral zone, the mandrel having a socket in the front surface for receiving an adaptor;
• and
• one or more of the following:
• a convex adaptor comprising a convex end portion, the convex adaptor being configured to be received in the socket such that the convex end portion defines a portion of the front surface of the mandrel;
• a concave adaptor comprising a concave end portion, the concave adaptor being configured to be received in the socket such that the concave end portion defines a portion of the front surface of the mandrel;
• a flat adaptor comprising a flat end portion, the flat adaptor being configured to be received in the socket such that the flat end portion defines a portion of the front surface of the mandrel.