US 5,517,259 A · Method of manufacturing toric single vision, spherical or aspheric bifocal, multifocal or progressive contact lenses

Abstract

Methods for providing a contact lens are described. According to a first embodiment, a patient is fitted with an optical preform and the position on the surface of the optical preform corresponding to the center location of the patients's pupil is identified. Then, the optical preform, a volume of polymerizable resin, and a mold comprising a casting zone are arranged, so that the resin occupies at least the intervening space between the mold and the optical preform in the area of the casting zone and so that the casting zone on the mold is aligned to a predetermined position with respect to the position on the surface of the optical preform corresponding to the center of the patient's pupil. Finally, the resin is polymerized to provide a contact lens with an optical modification corresponding to the casting zone. According to another embodiment, a mold having a weight or stabilization zone is selected to provide a resin mass on an optical preform (which can be, for example, toric, bifocal or multifocal, and so forth) sufficient to stabilize the optical preform. The resin mass is provided in a position based, for example, on the axis of cylinder of the finished lens, the orientation of the bifocal/multifocal region on the finished lens, and so on.

Claims24

Dependent claims

A method for providing a contact lens comprising:

fitting a patient with an optical preform;
identifying a position on the surface of the optical preform corresponding to the center location of the patients's pupil;
arranging the optical preform, a volume of polymerizable resin, and a mold comprising a casting zone, so that the resin occupies at least the intervening space between the mold and the optical preform in the area of the casting zone;
aligning the casting zone on the mold to a predetermined position with respect to the position on the surface of the optical preform corresponding to the center of the patient's pupil;
and
polymerizing the resin to provide a contact lens with an optical modification corresponding to said casting zone.

3 more elements

Dependencies are inferred from the claim text.

Method of manufacturing toric single vision, spherical or aspheric bifocal, multifocal or progressive contact lenses

Life of this patent

Method of manufacturing toric single vision, spherical or aspheric bifocal, multifocal or progressive contact lenses

Life of this patent

Abstract

Claims24