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A quantitative electro-oculographic method was used to assess the impairment in smooth-pursuit and vestibulo-ocular reflex suppression eye movements in 12 epileptic patients and eight normal volunteers. Both types of eye movement were impaired by a factor of 40% in the epileptic patients, and the impairment was at least partly due to the treatment with phenytoin and phenobarbitone. There was a strong positive correlation between the performances in vestibulo-ocular reflex suppression and smooth-pursuit.
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