Menicon Co., Ltd.

Keiji Sugimoto

Tadashi Sawano

Kazuya Miyamura

Tsuyoshi Watanabe

Asaki Suzaki

Haruyuki Hiratani

Noriko Iwata

Yasuhito Hishida

Shigeyasu Nagai

Masanori Kadoya

Hideaki Kondo

Disclosed is a contact lens having a back surface to be placed on a cornea. The back surface includes a generally circular central zone whose radius of curvature gradually decrease from its center toward its periphery, and an peripheral zone disposed around the central zone.

Contact lens

Disclosed is a contact lens including an optical zone having a substantially circular shape; an peripheral zone having an annular shape and located around the optical zone; and an intermediate zone having an annular shape and located between the optical and peripheral zones. The intermediate zone including a convex portion formed in at least one radial position of a back surface thereof so as to extend in a circumferential direction thereof with an outwardly curved surface as seen in a diametrical cross-section of the lens.

A water-absorptive contact lens obtained by saponification of a copolymer composed essentially of (A) from 1 to 30% by weight of a (meth)acrylate polymer having at least one polymerizable group per molecule on an average obtained by copolymerizing (a) an alkyl (meth)acrylate and (b) a monomer having at least two polymerizable groups per molecule, as the main components; (B) from 45 to 95% by weight of a fatty acid vinyl ester; (C) from 0.02 to 10% by weight of a crosslinking agent which is not decomposable by saponification; and (D) from 0.1 to 20% by weight of a crosslinking agent which is decomposable by saponification.

Water-absorptive contact lens and process for its production

1. A water-absorptive contact lens obtained by saponification of a copolymer composed essentially of:

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Kasugai, Japan

Keiji Sugimoto