Abstract: Provided is a soft contact lens obtained by visible ray polymerization of a mixture comprising one or more of unsaturated carboxylic acid(s) and one or more visible ray polymerization initiator(s), or a mixture comprising one or more of unsaturated carboxylic acid(s), one or more of unsaturated carboxylate(s) and one or more of visible ray polymerization initiator(s).

Abstract: The present invention relates to a process for producing a cyanopsia-correctable intraocular lens, which process is characterized by, in polymerizing a monomer capable of forming a transparent lens material upon polymerization to obtain an intraocular lens, adding, as an essential component, at least one member of yellow, yellowish brown and orange colorants and, as an optional components, an U.V. absorber and a crosslinking monomer. The intraocular lens obtained by the present invention has a light absorption characteristic close to that of human crystalline lens and is effective for correction of cyanopsia.

Abstract: This invention relates to a contact lens formed of a copolymer containing, as essential components, at least one fluorine-containing monomer and at least one hydrophilic monomer, and the contact lens of this invention has hydrous nature and sufficient oxygen permeability to alleviate a burden which is caused on the cornea when a contact lens is fitted on.

Abstract: A contact lens material which is suitable for producing a contact lens having intermediate and low hydrous nature and which has hardness suitable for machining by cutting and polishing, is formed of a copolymer obtained by copolymerizing a monomer mixture which contains, based on 100 parts by weight of the monomer mixture, 35 to 65 parts by weight of at least one fluorine-containing monomer of the formula (I), ##STR1## wherein R.sub.1 is CH.sub.3, R.sub.2 is H or CH.sub.3, a is an integer of 1 to 9, m is an integer of 1 to 5, n is an integer of 4 to 10, p is an integer of 8 or greater, q is an integer of 0 or greater, and p, q and n have the relationship of p+q=2n+1,and 30 to 45 parts by weight of at least one amide group-containing monomer as essential components and which also contains other monomer as an optional component. The contact lens is obtained from the above contact lens material.

Abstract: This invention relates to a contact lens formed of a copolymer obtained by copolymerizing a monomer mixture containing, as essential components, perfluorooctylethyloxyalkylene (meth)acrylate, siloxanyl (meth)acrylate, alkyl (meth)acrylate, a hydrophilic monomer and a crosslinking agent, and said contact is excellent in all of oxygen permeability, hardness and water wettability and is useful in practical use.

Abstract: The present invention relates to a high water content soft contact lens containing 50-70% of water, obtained by copolymerizing five particular monomers at particular proportions. The high water content soft contact lens of the present invention has excellent durability to stain removers, a high mechanical strength and excellent shape retention.

Abstract: A copolymer composed mainly of at least one monomer component selected from fluorine-containing (meth)acrylates and silicone-containing (meth)acrylates and a siloxane oligomer having a polymerizable functional group at the molecular terminals is useful as an oxygen-permeable hard contact lens material with excellent impact resistance.

Abstract: When trifluoroethyl methacrylate, hexafluoroisopropyl methacrylate, pentafluoro-n-propyl methacrylate and/or pentafluoro-n-butyl methacrylate which are fluorine-containing monomers, are added to a conventional monomer mixture for producing a soft contact lens, the resulting soft contact lens has the same optical properties and elasticity as conventional soft contact lenses have, and is very superior to the conventional ones in resistance to deposit and in shape stability.