The polymethyl methacrylate (PMMA) or copolymer thereof used to produce one-piece intraocular lenses is modified by a compression molding process to produce a much tougher material with improved mechanical properties. The process takes material in rod form and compresses into lens blanks. The molded...http://www.google.ca/patents/US5895610?utm_source=gb-gplus-sharePatent US5895610 - Method of making an intraocular lens with fracture resistant haptics
