Toric single vision, spherical or aspheric bifocal, multifocal o

Details Toric single vision, spherical or aspheric bifocal, multifocal o Toric single vision, spherical or aspheric bifocal, multifocal o

1992-11-23

1995-04-11

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

264 18, 264 24, 264 27, 351160H, 351161, 351177, G02C 704, B29D 1100

Patent

active

054063418

ABSTRACT:
A method for making a finished aspheric single vision, spherical or aspheric bifocal, multifocal or progressive addition contact lens includes the step of fitting a patient requiring a near correction with a single vision spherical or aspheric contact lens for optimal distance vision and comfortable fit. The patient is then over-refracted to determine the required near correction to be embodied in the contact lens. A portion of the optic corresponding to the center location of the pupil is marked on the convex side of the optic to form an optical preform. The optical preform is removed from the eye of the patient and the concave side of the optical preform is marked at a position corresponding to the mark on the convex side that denotes the center of the pupil. The mark disposed on the convex side of the optical preform is removed. A specified volume of polymerizable resin is placed in a mold embodying the required correction, which includes an add power zone so that the resin fills the intervening space between the mold and the optical preform. The add power zone is aligned on the optical preform to a predetermined position with respect to the mark on the optical preform designating the center of the pupil. The resin is then polymerized the optical preform is demolded to obtain the finished contact lens having the required correction.

REFERENCES:
patent: 5129718 (1992-07-01), Futhey et al.
patent: 5142411 (1992-08-01), Fiala
patent: 5170192 (1992-12-01), Pettigrew et al.
Kendall, C. A.; "Ultrafocal.RTM. Bifocal Contact Lens"; Contacto; Jan. 1976; pp. 31-35.

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