US 4,120,570 AGranted

Method for correcting visual defects, compositions and articles of manufacture useful therein

AssigneeSyntex (U.S.A.) Inc.

InventorNorman G. Gaylord

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Abstract

Visual defects of the human eye in the form of refractive errors such as myopia, hyperiopia, astigmatism, athakis and keratoconus are corrected by a therapeutic method which includes the step of fitting to the patient's eye a corrective contact lens fabricated from a copolymer of a polysiloxanylalkyl acrylic ester and an alkyl acrylic ester. These visual corrections are made in accordance with this method with concommitent reduction in corneal edema since lenses so used have improved oxygen permeability. According to the preferred practice of this method, the lenses utilized have improved wettability which increases wearing confort and reduces interference with corneal metabolism, thereby extending the time period during which the corrective effect of the method is achieved. The corrective effect of this method is also enhanced by the capability of the lenses utilized therein to be precisely machined and polished.

Claims1

Dependent claims

Method of treating visual defects of the human eye in the form of refractive errors which includes the step of fitting to the patient's eye a corrective contact lens fabricated from a solid copolymer of comonomers, said copolymer having increased oxygen permeability in comparison with poly(methylmethacrylate) and consisting essentially of

(a) about 10 to 70 parts by weight of a polysiloxanylalkyl ester of the structure. ##STR16## wherein (1) X and Y are selected from the class consisting of C.sub.1 -C.sub.5 alkyl groups, phenyl groups and Z groups,
(2) Z is a group of the structure ##STR17## (3) A is selected from the class consisting of C.sub.1 -C.sub.5 alkyl groups and phenyl groups,
(4) R is selected from the class consisting of methyl groups and hydrogen,
(5) m is an integer frome one to five, and
(6) n is an integer from one to three;
and
(b) about 30 to 90 parts by weight of an ester of a C.sub.1 -C.sub.20 monohydric alkanol and an acid selected from the class consisting of acrylic and methacrylic acids.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/830,509Filed 6 Sep 1977 · continuation
Priority: 16 Jun 1972
Granted: 17 Oct 1978
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

G02C 7/04
Lenses; Lens systems ; Methods of designing lenses: contact lenses for the eyes
C08F 220/14
Of monohydric alcohols or phenols: methyl esters , e.g. methyl acrylate
C08F 230/08
Containing a metal: containing silicon
C08L 43/04
Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon…:…

Family

Serial263,541Parent of this continuation-in-part · filed 16 Jun 1972
Serial461,882Parent of this continuation-in-part · filed 18 Apr 1974
Serial548,209Parent of this continuation · filed 10 Feb 1975
Serial698,592Parent of this continuation · filed 22 Jun 1976
3808178Parent of this continuation-in-part
US 4,120,570 AThis patent

From the US filing history. Foreign family members aren’t listed.