Abstract: A water-absorptive contact lens whose water content is in a range from 10% to 60% and which is formed of a polymeric material obtained by copolymerization of a polymerizable monomer composition that includes: (A) 20 to 70 wt. % of alkoxypolyethylene glycol (meth)acrylate having at least three ethylene glycol units, and (B) 30 to 80 wt. % of a silicon-containing macromonomer.

Abstract: A highly water-absorptive ophthalmic lens which is formed of a macromolecular material including vinyl alcohol unit as a major component, wherein the improvement comprises: the macromolecular material being formed by saponifying a copolymer obtained by copolymerization of a polymerizable monomer composition which consists of vinyl acetate and diethylene glycol divinyl ether; the ophthalmic lens having a water content in a range from 73% to 84%; and the ophthalmic lens having a ratio of a dimensional change of less than ±2% and is free from whitening after (A) the ophthalmic lens has been subjected to three cycles of a freezing-thawing operation wherein the ophthalmic lens formed of the macromolecular material is left at a temperature of not higher than −10° C. for not less than twelve hours, and is subsequently left at a temperature in a range from 15° C. to 30° C. for not less than six hours, and/or (B) the ophthalmic lens has been kept at a temperature in a range from 1° C.

Abstract: A highly water-absorptive ophthalmic lens which is formed of a macromolecular material including vinyl alcohol unit as a major component and whose water content is in a range of 50-90%, wherein: the macromolecular material is a cross-linked vinyl alcohol-allyl alcohol/halogenated-alkyl ethylene copolymer which includes allyl alcohol unit and/or halogenated-alkyl ethylene unit, together with the vinyl alcohol unit; and the ophthalmic lens has a ratio of a dimensional change of less than ±2% and being free from whitening after (A) the ophthalmic lens has been subjected to three cycles of a freezing-thawing operation wherein the ophthalmic lens formed of the macromolecular material is left at a temperature of not higher than −10° C. for not less than twelve hours, and is subsequently left at a temperature in a range from 15° C. to 30° C. for not less than six hours, and/or (B) the ophthalmic lens has been kept at a temperature in a range from 1° C. to 9° C. for three months.

Abstract: A method of sterilizing an intraocular lens formed of a cross-linked polymer, wherein the intraocular lens is accommodated in a sealed container which permits transmission of an electron beam therethrough but inhibits entry of microorganisms thereinto, and the intraocular lens is irradiated with the electron beam, for sterilization of the intraocular lens accommodated in the container.

Abstract: A contact lens having a circular colored area at center thereof, and has a mark arranged in the colored area. The mark is provided by applying deeper or different color on the colored area, or provided by masking the contact lens before applying color of the colored area.

Abstract: A soft contact lens made of a copolymer composed essentially of:(a) from about 30 to about 60 parts by weight of at least one monomer selected from the group consisting of long chain alkyl acrylates and methacrylates represented by the general formula: ##STR1## where R.sub.1 is a hydrogen atom or a methyl group, and R.sub.2 is a straight chained or branched alkyl group having from 5 to 18 carbon atoms;(b) from about 40 to about 70 parts by weight of at least one hydrophilic monomer selected from the group consisting of dimethylacrylamide, N-vinylpyrrolidone, a hydroxyalkyl acrylate and a hydroxyalkyl methacrylate; and(c) from about 0.05 to about 2.0 parts by weight of a cross-linking agent; and having a water content of from about 25 to about 50% by weight.

Abstract: A polymerization product suitable for contact lenses comprising (a) an organosiloxane monomer having the following general formula ##STR1## wherein n is an integer of 1 to 3, X is --(CH.sub.2).sub.p --O].sub.q in which p is an integer of 2 to 4 and q is 0 or an integer of 1 to 3, and Y.sup.1, Y.sup.2 and Y.sup.3 are methyl group or --O--Si--(CH.sub.3).sub.3, and (b) a hydrophobic methacrylic acid alkyl ester monomer. The polymerization product and cross-linked polymerization product have excellent oxygen permeability and proper hydrophilic property and are substantially water-nonabsorptive, and contact lenses made thereof can be comfortably worn continuously for a long period of time.

Abstract: A copolymer suitable for use as contact lenses, comprising a polymerization product of (a) at least one monomer selected from methyldi(trimethylsiloxy)sylylpropylglycerol methacrylate and methyldi(trimethylsiloxy)sylylpropylglycerolethyl methacrylate, (b) a hydrophilic monomer, (c) a methacrylic acid alkyl ester and (d) a cross-linking agent having at least two copolymerizable functional groups. Contact lenses made of the above copolymer has excellent oxygen permeability and can be comfortably worn continuously for a long term without a foreign body sensation and pain.