In this study a method of testing binocularity called the Tilt Aftereffect (TAE) was used before and during a subject's vision therapy program. There were 8 subjects, each being treated for general binocular dysfunction by private practicing optometrists. The inter-ocular transfer (IOT) of the TAE was measured pre and post-therapy to determine the improvement in binocularity. It was found that there was no significant improvement in the subjects' ability to perceive the lOT of the TAE. There was a wide range of variability in the pre to post measurements. It is thought that this may be indicating that the binocular pathway responsible for the interocular transfer is in a state of change and instability due to the effects of vision therapy.
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