Method of making an intraocular lens with fracture resistant hap

Details Method of making an intraocular lens with fracture resistant hap Method of making an intraocular lens with fracture resistant hap

1997-09-30

1999-04-20

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Reshaping or treatment of an optical preform

264 17, 264 24, 264138, 264325, 425808, B29D 1100

Patent

active

058956107

ABSTRACT:
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 lens blanks receive little or no compression strain in the center 4 mm optic zone. The compression is limited to the periphery region outside the center 4 mm zone. The intraocular lens fabricated from the molded lens blank exhibits greatly increased haptic mechanical properties and resistance to breakage.

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