Study of Visual Evoked Potentials in Patients Suffering from Exotropia

The present study aims to investigate the visual evoked potentials in patients with exotropia, a type of ocular deviation in which one or both eyes are deflected outwards.

Twenty-five patients with exotropia aged 6-8 years participated in this study as a case group, and twenty-five age- and sex-matched controls were selected as control. VEP was recorded using the Pattern Reversal checkerboard technique for all participants. Latency (msec) and amplitude (μV) of VEP, P100 peak were measured in both groups.

The mean amplitude of VEP, P100 peak was 2.92 and 7.84 μV in case and control groups, respectively, showing a statistically significant difference (P = 0.001). The difference in mean latency of the VEP, P100 peak was not statistically significant between the two groups (P = 0.45).

Exotropia is a visual disturbance that affects visual evoked potential P100 peak amplitude, whereas the latency of P100 remains intact.