A method of forming a polymer is disclosed. The method comprises: positioning a mould in relation to a bath containing a molten material to form a mould cavity between the mould and the molten material; adding a monomer within the mould cavity; and curing the monomer to form a polymer.

A cast mould for manufacturing a contact lens or an intraocular lens, wherein the cast mould is provided with a central part and a bearing ring and a flexible connection between the central part and the bearing ring. Further, an injection mould is provided for manufacturing such a cast mould and a method for manufacturing such a cast mould. The injection mould is provided with a mould cavity with a plunger biased by spring means towards the mould cavity which serves for compensating shrinkage which occurs during the curing of the plastic injected into the injection mould. Also described is a method for manufacturing a contact lens or intraocular lens with the aid of the cast mould, as well as a contact lens or intraocular lens obtained with this method.

A cast mold for manufacturing a contact lens or an intraocular lens, wherein the cast mold is provided with a central part and a bearing ring and a flexible connection between the central part and the bearing ring. Further, an injection mold is provided for manufacturing such a cast mold and a method for manufacturing such a cast mold. The injection mold is provided with a mold cavity with a plunger biased by a spring towards the mold cavity which serves for compensating shrinkage which occurs during the curing of the plastic injected into the injection mold. Also described is a method for manufacturing a contact lens or intraocular lens with the aid of the cast mold, as well as a contact lens or intraocular lens obtained with this method.

A method of spacing an object from a mould for the formation of a multi-layered polymer. The method comprises: attaching at least one spacer to the object; attaching the at least one spacer to the mould; and adding material to the mould to form the multi-layered polymer.