We evaluated the binocular visual function of 14 patients with Brown's syndrome and compared this data with that collected from 14 visually normal subjects of similar age and sex. Patients with Brown's syndrome underwent a full ophthalmologic examination including a detailed strabismological evaluation. Stereoacuity was measured with the Titmus and TNO stereotests. Visual evoked potentials (VEPs) were recorded. Patients with congenital Brown's syndrome had reduced stereoacuity levels compared to the control group. They also had longer binocular VEP latencies and smaller VEP amplitudes. Binocular enhancement of VEP amplitude was present in both groups but more evident in the control group. In conclusion, partial binocular visual functional abnormalities could be found in patients with congenital Brown's syndrome in addition to the characteristic ocular motility restrictions.