Contact lens
AssigneeMenicon Co., Ltd.
InventorsRyo Matsushita, Kazuharu Niwa, Akihisa Sugiyama
Life of this patent
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Abstract
A contact lens excellent in optical property, offering favorable feeling during the use thereof, and capable of continuous uses, which is composed of a hard portion in the central part and a soft portion in the periphery of the central part is provided. The contact lens comprising two kinds of polymers and having a hard portion arranged in the central part thereof and a soft portion arranged in the periphery of the central part, wherein a monomer mixture forming the hard portion contains at least one silicone-containing monomer, and the monomer mixture forming the hard portion and a monomer mixture forming the soft portion each contain at least one common hydrophilic monomer.
Claims10
A contact lens comprising two kinds of polymers and having a hard portion arranged in the central part of the contact lens and a soft portion arranged in the periphery of the central part, wherein a monomer mixture forming said hard portion contains at least one silicone-containing monomer, wherein the contact lens contains at least one common hydrophilic monomer in the monomer mixture forming said hard portion and a monomer mixture forming said soft portion, said common hydrophilic monomer being a monomer having not less than 5% of a water content as a homopolymer thereof, and wherein the contact lens has an oxygen permeation coefficient (Dk) of at least 64×10−11 (cm2/sec)·(mLO2/(mL×mmHg)).
A contact lens comprising two kinds of polymers and having a hard portion arranged in the central part of the contact lens and a soft portion arranged in the periphery of the central part, wherein a monomer mixture forming said hard portion contains at least one silicone-containing monomer, and the monomer mixture forming said hard portion and a monomer mixture forming said soft portion each contain at least one common hydrophilic monomer, wherein said silicone-containing monomer is a styrene which has a silane or a siloxane bond and is represented by the general formula (I):
- (wherein l is 0 or 1, and n and m are integers of 1 to 15).
Dependencies are inferred from the claim text.