| 摘要 |
<p>A bifocal lens is produced on either a previously formed blank lens, or completely in a singular casting between two molds. The bifocular lens is obtained by supporting a bifocal lower mold having a recessed bifocal well area on its concave surface and filling the lower mold with a resin material. By positioning an upper mold in vertically spaced relationship to the lower mold, the resin material is displaced to extend between the overlapping surfaces of the molds to form the configuration of the bifocal lens with a bifocular portion on the convex lens surface corresponding to the bifocal well on the lower mold. Curing of the. resin material situated between the molds and cooling the resin material and the molds forms the complete lens. Thereafter, a separating of the bifocal lens from between the molds leaves the bifocal lens in a position to be completed and installed in a pair of eyeglasses.</p> |
