A method for processing a first optical face and a second optical face of a lens, where a lens blank is positioned and gripped by a gripping device relying on reference datum indications rendering it possible to obtain topographic orientation for processing both faces of the lens, and wherein not more then one reference datum indication extends on a face of the lens. The control unit drives and controls the first electromagnetic driving source so as to move the infrared light cut filter blade to the receded position when using an infrared light. According to one example embodiment of the inventive subject matter, the teachertest administrator sits down with a student. This can help to increase the accuracy of determining when to halt the FORMING voltage.