Menicon Co., Ltd.

Menicon., Ltd.

Sadayasu Tanikawa

Shoji Ichinohe

Toshio Yamazaki

Tsuyoshi Watanabe

Akira Tsuzuki

Eri Ito

Yasuhiro Yokoyama

Mouad Lamrani

Naotaka Kamiya

Yuriko Watanabe

Shigeyasu Nagai

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

Process for preparing ocular lens with urethane compound and process for preparing urethane compound for medical instruments

A process for preparing an urethane compound for medical instruments, characterized by reacting a hydroxyl compound (A) with an isocyanate compound (B) in the absence of a catalyst or in the presence of a reaction catalyst other than an organic tin compound to give an urethane compound (I). According to the process, the urethane compound showing high safety can be easily prepared, in particular, while molecular weight of the compound is controlled.

Process for preparing urethane compound for medical instruments

An ophthalmic composition which contains a component A consisting of at least one member selected from the group consisting of polyoxyalkylene block copolymers and their derivatives, and a component B consisting of at least one member selected from the group consisting of glycyrrhizic acid and its salts.

Ophthalmic composition

A solution for contact lenses which comprises an amino acid type cationic surfactant and at least one nonionic surfactant.

Solution for contact lenses

A cleaning material for a contact lens formed of a polymer which is obtained by polymerizing a polymeric composition including at least a nonionic surface active agent having a polymerizable unsaturated double bond, and a cross-linking agent having a plurality of polymerizable unsaturated double bonds.

Contact lens cleaning material formed of a polymer

An ocular lens obtained by reacting a hydroxyl group-containing polymer shaped to have an ocular lens shape, with a silicon-containing compound of the formula (I):

Growing community of inventors

Kasugai, Japan

Sadayasu Tanikawa