Binocular luminance Interaction of stereo abnormals: Visually evoked potentials

Previously, binocular Interaction was studied by using dichoptically presented uniform fields whose luminance was modulated sinusoidally with a frequency of 2 Hz to elicit VEPs from stereo normal subjects. The first harmonic amplitude of VEPs decreased as interocular phase difference (IPD) Increased from 0° to 180°, and the second harmonic amplitude has shown an asymmetrical "V" shaped function of IPD. The trough of the "V" shape was at IPD = 90°, and the amplitudes at IPD = 180° were constantly smaller than at IPD = 0° at lower luminance but greater than at higher luminance. The present study attempts to determine the changes of VEPs In stereo deficient subjects with normal monocular visual acuities. We found that whether their VEPs were similar to normals or different from normals varied with (1) the diagnosis, (2) the mean luminance, and (3) the VEP component, I.e., VEP first or second harmonic.