Method for measuring the rotation of an assymetric contact lens

Details Method for measuring the rotation of an assymetric contact lens Method for measuring the rotation of an assymetric contact lens

1988-06-07

1990-12-11

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

049765337

ABSTRACT:
A contact lens comprising a corneal section, a vertical axis, and a shape adapted to maintain the lens at an intended orientation. The improvement comprises 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 extension 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 assymetric lens. Methods for measuring lens rotation using the invention 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

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