Monocentric corneal contact bifocal lens and method of...

G - Physics – 02 – C

Patent

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G02C 7/04 (2006.01)

Patent

CA 1294159

333 P 058 ABSTRACT OF THE DISCLOSURE A one-piece bifocal contact lens of monocentric no-jump form, having a bifocal segment front surface portion with a smaller radius of curvature than that of the distant vision segment, wherein the front surface of the bifocal segment is tangent to the distant vision segment at a point or along a line or locus at or near the center of the segment line, and wherein the surface separating these segments lies along a lens meridian. A lens is also disclosed which has a novel modified form of truncation to provide a ledge for the lower lid to push the lens upward during reading, while at the same time permitting the secondary and peripheral curves to remain completely intact throughout the circumference of the lens for maximum comfort.

510584

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