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Errors in spatial judgment associated with compensation of habitual fixation disparity

1 April 1987


Results found in a previous study in the area of ocular motor posturing and how it can be used to predict errors in spatial judgment indicated no apparent predictability under habitual conditions. The present investigative study was designed to determine whether perceptual adaptations to oculomotor imbalances tend to reduce spatial errors predicted from fixation disparity and/or heterophoria data. Errors in distance judgments due to induced changes in heterophoria have been demonstrated in earlier studies , but little research has addressed the effect of fixation disparity on spatial judgment. Theoretically, the misalignment of the primary lines of sight due to fixation disparity will cause a target to be perceived in a location other than its actual position. Results were inconclusive in determining the predictability of spatial error tendencies from fixation disparity (or heterophoria).


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