A centre for accommodative vergence motor control.

Abstract Latencies of response in accommodation, accommodative vergence and pupil diameter to changing accommodation stimuli as well as latencies in pupil response to light intensity changes, were measured. From this information, a block diagram representation of the accommodation, accommodative vergence and pupil systems which has the least number of blocks was deduced. The signal transmission delays in the various pathways of the model were determined and related to the known physiological delays. The results suggest the existence of a centre for motor control of accommodative vergence which is quite independent of the accommodation system.

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