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a spontaneous, brief, intermittent, horizontal oscillation of the eyes occurring during fixation; it often coexists with ocular dysmetria in cerebellar syndromes.
Farlex Partner Medical Dictionary © Farlex 2012
An involuntary, rapid, horizontal saccadic oscillation of both eyes while attempting to fixate an object. It is a sign of cerebellar disease. See ocular myoclonus; opsoclonus.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann