Patent ID: 8585940

Claim:
A method of making a refractive optics structure comprising: a) processing a polyolefin copolymer material to remove unwanted reaction byproducts that can contribute to reduced transparency of the polyolefin copolymer material in the ocular environment of the eye during use, said unwanted reaction byproducts selected from the group including i) homopolymers of a crosslinking component of the polyolefin copolymer material, ii) homopolymers of a glass-forming component of the polyolefin copolymer material, iii) water-soluble and non-water-soluble particles of a predetermined size corresponding to the characteristic wavelength range of visible light as well as water-soluble and non-water-soluble particles greater than said predetermined size; and b) forming the refractive optics structure from the polyolefin copolymer material processed in a), wherein the forming involves thermal activation of said crosslinking component of said polyolefin copolymer material in order to crosslink said polyolefin copolymer material; wherein the processing of a) involves A) precipitating polyolefin copolymer material in at least one solution that includes a polar solvent, B) dissolving the polyolefin copolymer material precipitated in A) in a solution that includes a non-polar solvent, and C) filtering of the solution of B) with the polyolefin copolymer material dissolved therein in a number of successive filtering stages.