Contact lens cast moulding.

摘要

A mould for cast moulding a contact lens comprises a first cup member (11) having a male mould surface (14) and a second cup member (16) with a female mould surface (19). The two cup members (11,16) form a piston and cylinder and are used in a pressure vessel (26) so as to apply loading pressure to deflect the mould surfaces (14,19) to maintain the surfaces in contact with a lens being cast. The mould is opened with the mould surface (14) facing upwardly. Hydrating fluid (35) is added to the first cup member (11) and a cover (34) sealed to the top of the first cup member (11).