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US 5,178,800 AGranted
Method for forming plastic optical quality spectacle lenses
AssigneeInnotech Corporation
InventorRonald D. Blum
Life of this patent
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Abstract
A fast, relatively inexpensive method and simple is disclosed for producing a finished plastic multifocal or progressive lens from a preformed lens which has a predetermined lens correction (i.e., curvature or prescription) at its optical center. The disclosed method produces a finished lens which has a multifocal or progressive region without changing the lens correction at the optical center of the lens.
Claims16
A method for making a finished lens having a multifocal or progressive region, said method comprising:
- providing a mold;
- providing an optical quality resin composition;
- providing a preformed plastic lens having a predetermined lens correction at its optical center, said lens having a molding surface;
- contacting said preformed lens with said mold such that the molding surface of said preformed lens and said mold form a cavity enclosing said resin composition, wherein said resin composition is compressed in said cavity solely by the weight of said preformed lens;
- and
- curing said resin composition, wherein said resin is cured using ultraviolet radiation;
- wherein said cavity is shaped to correspond to the shape of said multifocal or progressive region and is shaped such that the lens correction at the optical center of said resulting lens is the same as said predetermined lens correction at the optical center of said preformed lens.
4 more elements
Dependencies are inferred from the claim text.