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A mould for cast moulding a contact lens includes a first cup member having a male mould surface and a second cup member with a female mould surface. The two cup members form a piston and cylinder and are used in a pressure vessel so as to apply loading pressure to deflect the mould surfaces to main

A mould for cast moulding a contact lens includes a first cup member having a male mould surface and a second cup member with a female mould surface. The two cup members form a piston and cylinder and are used in a pressure vessel so as to apply loading pressure to deflect the mould surfaces to maintain the surfaces in contact with a lens being cast. The mould is opened with the mould surface facing upwardly. Hydrating fluid is added to the first cup member and a cover sealed to the top of the first cup member.

대표청구항 ▼

A mould usable only once in a cast molding operation for cast moulding a contact lens, comprising: i) a first mould part comprising a first base portion including a male mould surface surrounded by an annular surface defining a trough region on one side of the first base portion, an annular wall ext

A mould usable only once in a cast molding operation for cast moulding a contact lens, comprising: i) a first mould part comprising a first base portion including a male mould surface surrounded by an annular surface defining a trough region on one side of the first base portion, an annular wall extending away from said annular surface defining the trough region on said one side of the first base portion, a flange extending from an end of said annular wall and adapted for receiving a sealing cover to sealingly cover the contact lens within said first mould part to form a commercial package for said contact lens after said cast moulding operation; and ii) a second mould part comprising a second base having a female mould surface formed on one side thereof, said female mould surface being cooperable with said male mould surface to define a mould cavity therebetween, and an annular wall extending perpendicularly from the second base, the annular walls of the first and second mould parts being engageable in sliding relation to enable the two mould parts to function as a piston and cylinder to open and close the mould.