Menicon Co., Ltd.

Naotaka Kamiya

Yasushi Yamamoto

Yasuo Tarumi

Sadayasu Tanikawa

Noriko Iwata

Shigeyasu Nagai

Hiroaki Yanagawa

Miyuki Kamiya

A photochromic contact lens having a period of time for discoloring the contact lens from a colored state to the uncolored state shortened, wherein the photochromic contact lens is made of an oxygen-permeable polymer material having a second-order transition point of not higher than 110&#xb0; C., and formed to have an oxygen permeation coefficient of not less than 50, and wherein the contact lens contains a dye capable of exhibiting photochromism.

Photochromic contact lens having excellent discoloring characteristic

A water-absorptive soft contact lens comprising a polymer prepared by polymerizing a monomer mixture comprising (A) a fluorine-containing styrene derivative represented by the general formula (I): ##STR1## wherein R.sup.1 is hydrogen atom or methyl group, m is an integer of 1 to 3 and n is 0 or an integer of 1 to 7, and (B) N, N-dimethyl(meth)acrylamide. The water-absorptive soft contact lens has excellent oxygen permeability, high mechanical strength and excellent flexibility independent of water content.

Water-absorptive soft contact lens

An ocular lens material, wherein a cross linking agent of the formula: ##STR1## wherein R.sup.1 is a hydrogen atom or a methyl group, is used.

Ocular lens material

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Kasugai, Japan

Naotaka Kamiya