Blur-induced changes in the visual evoked potential.

Binocular vision has several advantages as compared with monocular vision. In this study, objective recordings of binocular functioning were studied with visual evoked potentials (VEP's). Lenses from plano through +1.50 D were added to reduce acuity monocularly and binocularly. Results indicate that the VEP, while sensitive to binocularly induced blur, does not reflect the changes in binocular vision which are produced by monocularly induced blur. The high contrast of the visual stimulus pattern (97%) may be responsible for the absence of attenuation during binocular viewing while one eye is blurred.