تاثير هتروفورياي ايجاد شده به وسيله منشور بر روي پتانسيل برانگيخته بينايي دوچشمي

The 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 Pioo component of the potential waves were evaluated. Results: The present study showed that heterophoia significantly causes increase in latency of BVEP, P1oo and decrease in amplitude of Pioo peak (p<0.001). Conclusion: BVEP may be a useful technique to evaluate and measure heterophoria values, namely BVEP phorometry.