In a plastic lens grinding machine of the type having a head mounted on a base and adapted to carry a lens pattern and a plastic lens having a base curvature, the head is capable of movement parallel to the axis of rotation of the plastic lens. A carriage is mounted on the base and is movable perpendicular...http://www.google.de/patents/US4394099?utm_source=gb-gplus-sharePatent US4394099 - Plastic lens contour cutting machine
