Investigates vertical fixation disparity, aiding prismatic correction in evaluating vertical heterophoria and anisometropia.
We studied vertical fixation disparity (VFD) with the purpose of assisting the clinician in the evaluation of patients having vertical heterophoria and/or vertical anisometropia and in the prescription of an appropriate vertical prismatic correction. Our research shows that VFD (1) represents a relatively stable and reliable measurement of the vertical deviation; (2) provides the clinician with a mechanism to study a patient's ability to adapt to an induced vertical fusional demand; and (3) provides a process to determine the amount of the vertical prismatic correction.
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Rutstein et al. (1986) studied this question.
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