Fixation Disparity And Its Effect On Suprathreshold Stereopsis.

There have been many studies demonstrating the effects of the amount and direction of heterophoria on stereopsis 1,2 as well as the amount of associated phoria on stereopsis' but most of these studies focused on stereoscopic threshold. While there is value in determining these factors and their affect on the threshold of stereopsis, this is not the type of stereopsis people use in normal everyday situations. With this in mind, we wish to investigate how the amount and direction of fixation disparity influences suprathreshold stereopsis.