Paragon Optical, Inc.

Pilkington Barnes Hind, Inc.

Sola Usa, Inc.

Other

Pilkington Visioncare, Inc.

Donald J Ratkowski

William J Burke

Lisa A Folk

Ping-chang Lue

Arthur J Drew, Jr

Joseph I Weinschenk, Iii

Lisa A Pettigrew

An interpenetrating network copolymer, method of producing same, and method of producing optical lens blanks and finished lenses therefrom. The method broadly involves the preparation of first and second mixtures of polymerizable vinyl monomers and interrupting the polymerization of the first mixture at a relative viscosity of from about 1.05 to about 10 by admixing the partially polymerized first mixture with the second mixture to create a casting solution and thereafter, when desired, polymerizing molded casting solution in heat to create a solid lens material.

Contact lenses and materials and methods of making same

An oxygen permeable bifocal contact lens with a Dk of at least 10.times.10.sup.-11 in which a distance vision portion having a refractive index of not more than 1.49 is formed as a preform in which there is provided a recess, and a near distance vision portion having a refractive index of at least 1.540 is formed by filling the recess with a monomer mixture and polymerizing. It is preferred that the distance vision portion be formed as an interpenetrating network copolymer by partially polymerizing one monomer mixture to a predetermined relative viscosity and then adding a second monomer mixture and copolymerizing the resulting mixture. The near distance vision portion may also be formed as an interpenetrating network in the same manner.

Oxygen permeable bifocal contact lenses and their manufacture

Method of mold contact lenses

A mold assembly for casting optical lenses in which an integral lens blank-mold cup unit is created by placing liquid monomers in a cup mold which tightly adheres to polymerized lens material. A radial die is disposed upon the cup mold to contain the monomers during polymerization and to provide the polymerized material with an optical surface. A contact lens is manufactured from the integral lens blank-mold cup unit by machining off the first cup and then extraneous portions of the blank to create a finished lens.

Lens mold assembly

A copolymer composition, especially suited for fabricating optical lenses comprising a copolymer of copolymerized comonomers which include in weight percent about one to about twenty percent by weight of an acryloxyalkylsilanol; about one to about fifteen percent of a polyacryloxyalkylpolysiloxane; about thirty to about seventy five percent of an siloxy substituted ester of acrylic or methacrylic acid; from about one to about 35 percent of an alkyl or cycloalkyl acrylate or methacrylate having from one to twenty carbon atoms; from about one to about twenty percent of a polyol diacrylate; and from about one to about twenty percent of a wetting monomer. Contact lenses and contact lens buttons are formed of such copolymer of copolymerized comonomers by conventional techniques, by injection molding, and by compression molding.

Polyacryloxyalkylsilanol lens composition, articles and method of

New copolymer composition, methods for processing the copolymers into optical devices and articles resulting therefrom, especially intraocular and contact lenses having outstanding extended wear and daily wear properties. The composition comprises, in weight percent: from 3% to 35% polyfluoroalkyl acrylate; from 45% to 65% acryloxyalkylpolysiloxane; 1% to 15% acryloxyalkylsilanol; 2% to 20% polyacryloxyalkylpolysiloxane; 2% to 15% polyol polyacrylate and 2% to 15% polymerizable ethylenically unsaturated monomeric wetting agent such as acrylic acid. The composition may also contain 0 to 15% acrylic acid ester of a monohydric alcohol having no more than 20 carbon atoms and from 0.05% to about 2.0% of a free radical initiator.

Lens composition articles and method of manufacture

A copolymer composition, especially suited for fabricating optical lenses comprising a copolymer of copolymerized comonomers which include about one to about 25 percent by weight of an acryloxyalkylsilanol; about 0.5 to about 15 percent by weight of a polyacryloxyalkylpolysiloxane; about 5 to about 60 percent by weight of an siloxy substituted ester of acrylic or methacrylic acid; and from about 35 to about 90 percent by weight of an acrylic or methacrylic ester of an alkanol having from one to twenty carbon atoms. Contact lenses and contact lens buttons are formed of such copolymer of copolymerized comonomers by conventional techniques, by injection molding, and by compression molding.

Lens composition, article and method of manufacture

A copolymer composition, especially adapted for use in fabricating a contact lens comprises a copolymer of comonomers which include about 1-95 parts by weight of hydroxy silane esters of acrylic or methacrylic acid having a silanol functionality of 10-20% and about 99-5 parts by weight of a C.sub.1 -C.sub.20 alkyl ester of acrylic or methacrylic acid. Contact lenses and contact lens buttons are formed of such copolymer by conventional techniques and also by injection molding and by compression molding.

Silane ester contact lens composition, article and method of manufacture

A copolymer composition, specially adapted for use in fabricating a contact lens comprises a copolymer of comonomers which include about 1-95 parts by weight of hydroxy silane esters of acrylic or methacrylic acid and about 99-5 parts by weight of a C.sub.1 -C.sub.20 alkanol ester of acrylic or methacrylic acid. Contact lenses and contact lens blanks are formed of such copolymer by conventional techniques and also by injection molding.

Contact lens composition, article and method of manufacture

The present invention relates to lenses and more particularly relates to the method of forming prescription contact lenses of the single vision, bicurve, lenticular, bifocal and other types by injection molding. The lens is formed from a blank having a cylindrical configuration with a concave or convex surface. The concave or convex surface forms a surface such as the base curve of the completed lens minimizing finishing operations. The lens blanks are supplied to the practitioners in a series having a completed or substantially completed curved surface. The lenses are formed by injection molding closely controlling parameters such as injection pressure, time, and temperature to avoid internal stress in the lens.

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Mesa, AZ, United States of America

Donald J Ratkowski