Patterned and unpatterned visual evoked responses in strabismic and anisometropic amblyopia.

The VERs of 12 strabismic and anisometropic amblyopes were studied using unpatterned stimuli varied with respect to intensity, wavelength and frequency, and also patterned stimuli. While the unpatterned stimulus conditions did not differentiate between amblyopic and non-amblyopic eyes, VERs elicited by small checkerboard patterned stimuli were significantly reduced in amplitude in amblyopic eyes (p less than 0.01); however, there was no relationship between the reduction in visual acuity and that of the VER amplitude. VER latencies were not significantly different in amblyopic and non-amblyopic eyes across all stimulus conditions.