Hydrogel contact lens

Details Hydrogel contact lens Hydrogel contact lens

1986-08-14

1989-04-11

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

G02C 704

Patent

active

048200387

ABSTRACT:
A high water content hydrogel contact lens with improved oxygen transmission combined with good movement characteristics over the cornea to prevent corneal damage and configured for low minus powers. The lens body has an ultra smooth molded or cast posterior surface with a center thickness in cross-section which is no greater than 0.08 mm and has a small edge-to-edge diameter less than 14.4 mm. With the lens in place on the eye, the eyelid engages a thickened, annular edge of the lens to provide some lens movement on the cornea of about 0.50 mm to assist in the removal of metabolic waste products from behind the lens. The thickened edge is configured to allow the eyelid to smoothly flow over the lens and to maintain good comfort to the wearer of the lens and for these purposes includes a posterior peripheral surface curve to generally conform to the curvature of the sclera of the eye.

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Influence of Wearing Schedule on Extended--Wear Complications--Emily Kenyon et al-Center of Cornea Research, University of California, School of Ophtometry; Opthalmology, vol. 93, No. 2, Feb. 1986--pp. 231-236.

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