Asymmetric contact lens

Details Asymmetric contact lens Asymmetric contact lens

1990-11-16

1991-11-05

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351160H, 351162, 351177, 351219, G02C 704, A61B 300

Patent

active

050627015

ABSTRACT:
A contact lens comprising a corneal section, a vertical axis, and a shape adapted to maintain the lens at an intended orientation. The lens has either a visible horizontal line segment located in the corneal section perpendicular to the vertical axis and/or three visible radial line segments in the corneal section, the first of the line segments located on the vertical axis, and the second and third segments located on either side of the first segment such that the extensions of the segments would pass through a geometric center of the corneal section forming two 20.degree. angles. The lens is useful for measuring the rotation of an asymmetric lens. Methods for measuring lens rotation using the inventive lenses are also disclosed.

REFERENCES:
patent: 3454332 (1969-07-01), Siegel
patent: 4268133 (1981-05-01), Fischer et al.
patent: 4309085 (1982-01-01), Morrison
patent: 4525044 (1985-06-01), Bauman
patent: 4976533 (1990-12-01), Hahn et al.
Durasoft-2 Optifit Toric.RTM. Lens on Sale Since Sep. 1, 1988 and Descriptive Brochure Copyrighted 1988.

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