Abstract
The metric characteristics of horizontal saccadic eye movements are defined and analyzed following detailed electro-oculographic recordings in 25 normal subjects. Small (10°) saccades are usually normometric, but accuracy decreases with larger amplitudes producing undershoots of the fixation targets. Approximately 20 per cent of 20° and 30° saccades are transiently dysconjugate (1°–3°) at termination. The most common dysconjugate pattern demonstrates excessive convergence due to momentary overshooting of the adducting eye or undershooting of the abducting eye. The authors question an inviolate interpretation of Hering's Law and discuss the mechanisms of the dysconjugacies in light of current concepts of the neurophysiology of eye movements.
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