PRODUCTION OF LENS FOR CORRECTING SIGHT

摘要

PURPOSE:To enable the easy production of the multifocus contact lens for pressbyopia by injecting polymerizable monomers and nonpolymerizable compds. into the hole or recessed part of a plastic material and diffusing monomer particles, then subjecting the material to a polymn. treatment. CONSTITUTION:This process has a stage for injecting at least one kind of the polymerizable monomers and at least one kind of the nonpolymerizable monomers into the hole or recessed part of the plastic material and a stage for diffusing the monomer molecules and subjecting the monomers to the polymn. treatment. Namely, the plastic material is swollen by the monomers to form a swollen layer on the surface and the selective diffusion of the mixture composed of two kinds of the monomers (the polymerizable monomers and the nonpolymerizable compds.) or the monomers and oligomers or the monomers and polymers into the swollen layer is executed. The swollen layer is subjected to the polymn. treatment while the compsn. distribution is maintained to constitute the plastic material having the refractive index distribution complying with the compsn. distribution. As a result, the multifocus contact lens for pressbyopia and intraocular lens having excellent transparency are easily produced.