Method of manufacturing toric single vision, spherical or aspher

Details Method of manufacturing toric single vision, spherical or aspher Method of manufacturing toric single vision, spherical or aspher

1994-04-08

1996-05-14

Nelms, David C.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351161, 351177, G02C 704

Patent

active

055172598

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.

REFERENCES:
patent: 5129718 (1992-07-01), Futhey et al.
patent: 5142411 (1992-08-01), Fiala
patent: 5170192 (1992-12-01), Pettigrew et al.
patent: 5191366 (1993-03-01), Kashiwagi
patent: 5391589 (1995-02-01), Kiguchi et al.
patent: 5404183 (1995-04-01), Seidner
Contacto, Jan. 1976; pp. 31-35; Kandall, C.A.: Ultrafocal.RTM. Bifocal Contact Lens.

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