Patent ID: 8398902

Claim:
A method of moulding a lens for correction of vision from a transparent resin, the method comprising: providing a mould cavity in which the lens is to be moulded, the sides of the cavity which correspond to the front and rear surfaces of the lens being formed by two sheets, at least one of which is flexible; filling the mould cavity with a transparent resin; adjusting the amount of resin in the cavity to thereby deform the flexible sheet(s) so that the shape of the lens defined by the sheet(s) will provide a desired power; and curing the resin, wherein said sheets are transparent, and the adjustment of the amount of resin in the cavity to deform the flexible sheet(s) is carried out while the eventual user of the lens is looking through the transparent sheets and the resin, so that the shape and power of the lens can be adapted to suit to the eventual user's vision.