Abstract: An improved corneal contact lens for use in orthokeratology wherein the lens has an anterior surface, posterior surface and includes a tear zone which defines a tear reservoir located on the posterior surface of the lens. The improvement involves providing at least one fenestration surface located in the tear zone which defines an opening extending through the contact lens from the anterior surface to the posterior surface. The openings in the tear zone relieve fluid pressure which was found to cause certain symptoms, such as lens adhesion, tightening and general wearing discomfort. The fenestrations in the tear zone provide enhanced wearing comfort without adversely affecting the cornea-shaping properties of the lens.

Abstract: Aspheric corneal contact lenses are used to treat myopia by controlled corneal molding. In one embodiment of the method, the lens includes an asymmetric central zone which provides multiple focusing capability to correct both near and far vision. A tear zone is located concentrically around the central zone. The tear zone is integral with the central zone and has a radius of curvature which is smaller than the central zone. The lens also includes a peripheral zone located concentrically around the tear zone wherein the peripheral zone has a radius of curvature equal to or greater than the central zone.

Abstract: A multiple focus corneal contact lens for use in treating myopia by controlled corneal molding. The lens includes an asymmetric central zone which provides multiple focusing capability to correct both near and far vision. The tear zone is located concentrically around the central zone. The tear zone is integral with the central zone and has a radius of curvature which is smaller than the central zone. The lens also includes a peripheral zone located concentrically around the tear zone wherein the peripheral zone has a radius of curvature equal to or greater than the central zone.

Abstract: A corneal contact lens for use in treating myopia by controlled corneal molding. The lens includes a central zone having a central zone radius of curvature and a tear zone. The tear zone is located concentrically around the central zone and has a radius of curvature which is smaller than the central zone. A transition zone is provided between the central zone and the tear zone wherein the transition zone has at least one transition ring. The lens may also include a peripheral zone which is located concentrically around the tear zone wherein the peripheral zone includes multiple peripheral curves having radii of curvature equal to or greater than the central zone.

Abstract: There are provided extended-wear lenses formed by polymerizing an organosilicon monomer, a fluoroorgano monomer, a hydrophilic monomer, and a crosslinking agent. The product includes a benzotriazole and/or a benzophenone UV-absorbing agent and is is easily machinable to any prescription, permitting continuous wear, with oxygen permeability in excess of 50.times.50.sup.-11 (cm.sup.2 /sec)(ml O.sub.2 .times.mm Hg) and a receding contact angle of less than 45.degree. C. The bulk of the monomer content is the fluoorgano monomer and/or organosilicon monomer, which content is limited to 35 parts by weight, with lesser amounts being preferred.

Abstract: There are provided extended-wear lenses formed by polymerizing an organosilicon monomer system, at least a portion of which is a hydroxyorganosilicon monomer, a fluoroorgano monomer, a hydrophilic monomer, and a crosslinking agent. A UV-absorbing agent is optionally present. The product is easily machinable to any prescription, permitting continuous wear, with an oxygen permeability in excess of 50.times.10.sup.-11 (cm.sup.2 /sec) (ml O.sub.2 .times.mm Hg).

Abstract: A corneal contact lens for use in treating myopia by controlled corneal molding. The lens includes a central zone having a central zone radius of curvature and a tear zone located concentrically around the central zone. The tear zone is integral with the central zone and has a radius of curvature which is smaller than the central zone. The lens may also include a peripheral zone located concentrically around the tear zone wherein the peripheral zone has a radius of curvature equal to or greater than the central zone.

Abstract: There are provided continuous-wear lenses formed by polymerizing a hexafluoroisopropyl ester of an unsaturated carboxylic acid which can have an oygen permeability in excess of at least 150.times.10.sup.-11 (cm.sup.2 /sec.) (ml O.sub.2 /ml.times.mm Hg). A UV-absorbing agent is optionally present.

Abstract: The method of making lenses for the eyes from an improved modified polymerization product of methyl methacrylate. The product is in the as-cast form from which satisfactory lenses can be made, but is improved in optical clarity and wetability by heat treating and shrinking the product in a linear direction and thickening the product in another direction prior to cutting the product for making the lenses. After cooling the lens blanks are cut and the lenses are made by conventional grinding.