Patent ID: 8685292

Claim:
A method for manufacturing a spectacle lens made of plastic material wherein the method comprises the steps of: providing a plastic circular blank made by non-cutting shaping procedures, the plastic circular blank comprising: an interior lens element comprised of a plastic material suitable for the manufacture of a spectacle lens, the interior lens element being substantially of a size and shape suitable for the manufacture of a spectacle lens, the interior lens element having two surfaces being of an arbitrary geometry, and a ring fixture comprised of a plastic material different than the plastic material comprising the interior lens element, the ring fixture concentrically surrounding the interior lens element, the ring fixture being fixedly attached to the interior lens element; mechanically working the plastic circular blank by mechanical production steps using cutting procedures selected from the group consisting of milling, lathing, grinding, polishing, and engraving, wherein during the mechanically working step, the ring fixture is available for mounting, depositing and stabilizing the plastic circular blank, the ring fixture being partially maintained during the mechanical production steps; and cutting off the entire ring fixture so as to remove all plastic material outside the periphery of said interior lens element to form a lens suitable in size and shape for use as a spectacle lens.