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Purpose To investigate the effect of an artificial scotoma on open-loop disparity vergence responses and vergence control mechanisms, we examined open-loop disparity vergence responses to disparity stimuli using monocular artificial scotomas in normal subjects. Methods Using a mirror haploscope with two computer monitors, we delivered disparity stimuli on a pair of random dot patterns subtending 40×30 degrees at 47 cm from each eye. The scotomas were black circles located in the center of a random dot pattern for the left eye. Eye movements of both eyes were recorded with a magnetic search coil system. Results We first found that the amplitudes of disparity vergence responses were gradually decreased and the latency of disparity vergence responses were moderately increased as the size of the scotomas was increased. Secondly, monocular responses from each eye were symmetrical although the stimuli to each eye were asymmetrical. Conclusions The results suggest that the monocular eye movements in disparity vergence are controlled by a binocular central mechanism, not driven separately by monocular inputs in the open-loop window.

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