[ effect of prism-induced heterophoria on binocular visual evoked potential]

Purpose: to evaluate the effect of prism induced heterophoria including esophoria and exophoria on binocular visually evoked potentials [BVEP]

Methods: esophoria and exophoria were induced with base-in and base-out prisms, respectively. Binocular visual evoked potentials for different heterophoia values were recorded using pattern reversal visual stimuli with a 6.5 min arc check size. Amplitude and latency of P[100] component of the potential waves were evaluated

Results: the present study showed that heterophoia significantly causes increase in latency of BVEP, P[100] and decrease in amplitude of P[100] peak [p<0.001]

Conclusion: BVEP may be a useful technique to evaluate and measure heterophoria values, namely BVEP phorometry