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In the early days of contact lens manufacturing PMMA lenses were produced with equipment of limited accuracy and polishing was used to give the lens its final surface and geometric quality. One of the important developments in lens manufacture was the introduction of high precision lathes in the early 1990s. The methods of
manufacturing are spin casting, cast molding, light stream technology. The production methods
for the new soft multifocals include shape casting, lathe cutting and
molding. |
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