Method of producing angular tolerance markings for lenses for co

Details Method of producing angular tolerance markings for lenses for co Method of producing angular tolerance markings for lenses for co

1999-04-07

2000-07-11

Epps, Georgia

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351160H, 351176, 351177, G02C 704, G02C 702

Patent

active

060862025

ABSTRACT:
In a method of producing tolerance markings on a contact lens for correcting astigmatism which has a given cylinder, the tolerance markings comprise at least two straight line segments in the peripheral part of the contact lens with an angle 2.alpha..sub.T between them. The angle 2.alpha..sub.T between the two straight line segments of the tolerance markings depends on the cylinder of the contact lens.

REFERENCES:
patent: 4268133 (1981-05-01), Fischer et al.
patent: 4310225 (1982-01-01), Davis
patent: 5062701 (1991-11-01), Drazba et al.
patent: 5100225 (1992-03-01), Rothe
Manual Contact lens Practice, 4.sup.th edition (1988) "Hydrogel lenses for astigmatism"--pp. 659-679 XP 002087185--pp. 669-677.

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