Special receptacle or package – For eyeglass or spectacle – Contact lens
Patent
1989-12-06
1991-08-06
Foster, Jimmy G.
Special receptacle or package
For eyeglass or spectacle
Contact lens
53431, 249 82, 264 24, 264 26, 425808, B65D 8122
Patent
active
050369717
ABSTRACT:
A polyolefin mould for casting contact lenses from a polymerizable monomer composition which shrinks on polymerization, said mould comprising: male (50) and female (51) mould halves at least one of which has a flexible diaphragm portion (53, 54) which is shaped to provide a surface corresponding to a lenticular surface, said mould halves (50, 51), when closed together, cooperating to define a mould cavity (52) for receiving a volume of said monomer composition, at least one of said mould halves (50, 51) having a shoulder portion (55, 56) surrounding said cavity and shaped to engage with said other mould half to define an edge moulding portion of said cavity: whereby in use said diaphragm (53, 54) is deflected into said cavity under forces exerted on said mould by said monomer composition when polymerized in said closed cavity (52), thereby compensating for the shrinkage occurring on polymerization and avoiding the formation of bubbles or voids in the resulting lenses. In addition, the invention includes a method of casting contact lenses using a mould of the above kind.
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Henderson Peter
Seden William E.
Shepherd David W. J.
CooperVision Optics, Ltd.
Foster Jimmy G.
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