Patent ID: 7845615

Claim:
A plastic mold for making a contact lens, comprising a first mold half having a first optical surface in contact with the lens material and a second mold half having a second optical surface in contact with lens material, wherein the first mold half is permeable to UV light and the second mold half is capable of absorbing UV light having a wavelength greater than 280 nm, wherein the first mold half and second mold half each have an edge, wherein said first mold half and said second mold half are configured to receive each other such that a cavity is formed between said first optical surface and said second optical surface, wherein the cavity defines the shape of a contact lens to be molded, wherein the received mold halve edges define a contact zone, wherein the lens material is polymerizable and/or crosslinkable by means of an appropriate energy, wherein at least one of the mold halves is made from a mold material comprising a polymer selected from the group consisting of cyclic olefin copolymers or a chemically crosslinked polymer consisting of allyl diglycol carbonate monomer, wherein the polymer has a very low oxygen permeability characterized by a value of less than 5 × 10 - 11 ⁢ ( ml ⁢ ⁢ O 2 ⁢ ⁢ at ⁢ ⁢ STP ) ⁢ ( mm ) ( cm 2 ) ⁢ ( s ) ⁢ ( torr ) so as to be capable of substantially minimizing and/or eliminating inhibition of polymerizing and/or crosslinking of the lens material at interface between the lens material and the first or second optical surface by preventing oxygen from reaching the first or second optical surface during polymerizing and/or crosslinking process.