Visual fields were measured in 4 binocularly deprived cats and 2 controls. The animals were tested monocularly in the area between 60 degrees contralateral to the open eye and 105 degrees ipsilateral. No difference was found between visually deprived and control cats in response to stimuli presented in the binocular segment of the visual field from 30 degrees contra laterally to 30 degrees ipsilaterally. The stimuli placed on the 45 degrees line contralaterally elicited a lower response in binocularly deprived cats than in the controls. The results show that in binocularly deprived cats the visual field can be controlled by the retinal periphery up to 45 degrees.