IMAGE REFRACTION SYSTEM AND METHOD

摘要

An image refractor, system and method are designed to improve refraction tests by allowing an examinee to compare, by viewing through at least one eye, at least two disparate images of the same acuity target, substantially side-by-side and simultaneously. The image refractor incorporates at least two prisms through which the acuity target is viewed. Embodiments may be attached to a standard phoropter and rotated into the visual axis so that the at least two images are produced by a combination of the lenses in the phoropter and the superimposed lenses of the image refractor. Embodiments determine the optimum correction for the sphere, cylinder, and axis of the refraction.

主权项

1. A refraction system, comprising:
a phoropter having plural lenses through which an examinee can view an acuity target presented to the examinee through a selected one of said plural lenses, said plural lenses having optical powers differing from each other; and an image refractor comprising a bi-prism with a refractive lens power on at least one side thereof differing from a refractive power on at least another side thereof, said image refractor mounted on the phoropter in a manner allowing said image refractor in at least one position to be overlapped with said selected lens for presenting said acuity target to the examinee as at least two images of adjacent targets, each differently refracted from the other target.