Patent ID: 7980920

Claim:
A method of manufacturing a spectacle lens from a spectacle lens blank, the method comprising: providing the spectacle lens blank, the spectacle lens blank having a concave surface, a convex surface, and an edge shape; blocking either the convex surface or the concave surface of the spectacle lens blank to a blocking member; obtaining information including (1) a prescription of a finished spectacle lens, (2) a finished edge shape of the spectacle lens blank, and (3) an optical center position in the finished edge shape, the finished edge shape being an outer peripheral shape of the finished spectacle lens that corresponds to a frame rim shape; grinding and polishing the unblocked surface of the spectacle lens blank based on the information obtained in the obtaining step, inscribing provisional reference marks at positions outside a region of the finished edge shape on the optical surface of the convex surface or the optical surface of the concave surface based on the information obtained in the obtaining step, the provisional reference marks defining a geometrical horizontal reference line and a geometrical perpendicular reference line which are orthogonal to each other and intersect at the optical center position which corresponds to a geometrical center of the spectacle lens blank; blocking the convex surface or the concave surface that has not been grinded or polished in the grinding and polishing step to the blocking member and aligning the spectacle lens blank to the lens machining tool, with reference to the provisional reference marks inscribed in the inscribing step, before grinding and polishing the convex surface or the concave surface that has not been grinded or polished in the grinding and polishing step; grinding and polishing the convex surface or the concave surface that has not been grinded or polished; and edging the spectacle lens blank to obtain a finished spectacle lens based on the information obtained in the obtaining step.