Description
The testing of fixation disparity at near, as of recent, has become a clinically employable indication of the status of one's binocular function. The question at hand, however, is one of fatigue. Do fixation disparity curves change after stressing the oculomotor systems of normal patients? In an attempt to answer this, forty fixation disparity curves were generated as part of routine optometric examinations before and immediately after vergence facility testing. The fixation disparity curves from these twenty patients were carefully analyzed
both subjectively and objectively. Subjective inspection indicated a greater number of eso curves than expected, both initially and after vergence facility testing. Visually, the curves indicated a wide range of change, after vergence facility, in amount and type of change. Objectively, via a paired t test, patients with initial normal curves demonstrated fatigue after vergence facility.
