Patent ID: 7413503

Claim:
A lens preparation method comprising: selecting, among a plurality of polishing tools, a polishing tool having a first curvature radius which is smaller than an average curvature radius of a surface to be polished of a lens, wherein said first curvature radius is closer to the average curvature radius of the surface than any of the curvature radii of the plurality of polishing tools; bringing the elastic polishing tool having an outer diameter smaller than a length of a major axis of the lens into contact with the surface to be polished of the lens; and rocking the elastic polishing tool and/or the lens while rotating the lens in one direction and rotating the elastic polishing tool in an opposite direction, thereby polishing said surface, wherein an outer circumference of said lens has a non-circular elliptical shape, and wherein a moving range of a rotation center of the elastic polishing tool which moves relative to the lens is within a length of a minor axis of the substantially elliptical shape, and wherein the moving range of the rotation center of the elastic polishing tool while the elastic polishing tool is in contact with the lens, is a circular region having a radius that extends along the minor axis of the lens from a rotation center of the lens to the outer circumference of the lens.