| 摘要 |
A method of making bifocal resinous lenses by providing a positioning cylinder connected to a low refractive index polymer. Cutting a convex optical surface orientated to the positioning cylinder. A high index polymer is cast on the low index optical surface and a second shorter radius convex optical surface which intersects both the high and low refractive index materials is cut and polished. Additional low index polymer is cast over the second shorter radius surface and polymerized. A bifocal lens blank is cut from the polymer mass having the high refractive index surfaces orientated to the exterior blank surfaces.
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