Method and apparatus for measuring toric contact lens rotation

Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks

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351212, 351247, 33507, G02C 702, A61B 310, G01B 100

Patent

active

059632992

ABSTRACT:
A method and apparatus for accurately observing a toric contact lens rotation for determining the prescription of a contact lens on an astigmatic eye, by providing a lens line guide alignment plate having a gravity responsive pivotal indicator, angle indicia arranged about the indicator, and a guide edge spaced from the indicator, a contact lens having at least one indicator marking, a slit lamp or other device for projecting a slit light beam on the lens to bisect the lens, rotationally orienting the slit light beam into alignment with the contact lens indicator marking, angularly orienting the guide edge to be in alignment with the rotated slit light beam, and reading the angle of the pivotal indicator relative to the indicia to ultimately determine the toric lens prescription.

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Life-Link Slope Meter, Life-Link International of Jackson Hole, Wyoming, .COPYRGT. 1980.

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