| 摘要 |
A contact lens (14) having a finished shape including a concave base curve (12) and a convex front curve (18) is made by molding a plastic blank (10) having a pair of opposite curved surfaces (11, 16) respectively approximating the base curve (12) and front curve (18). The surfaces (11, 16) of the blank (10) are machined to produce a lens (14) having the finished shape. Since these surfaces as molded conform approximately to the finished shape, only a minimum of machining is necessary as compared to the machining required in conventional methods. This reduces the time needed to manufacture a lens and extends the useful life of the cutting tool used for machining. |
