CLINICAL OBSERVATIONS OF OPTOKINETIC HYPERNYSTAGMUS

概要

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It has been described that optokinetic disturbances are diminutions of nystagmus. However, the present authors noted that there was an abnormality showing hypernystagmus in optokinetic nystagmus of clinical cases.<BR>A cylinder was used in order to produce optokinetic stimuli. The cylinder was rotated electrically with angular acceleration of 2°/sec for 90 seconds. The resultant nystagmus was recorded by using an electronystagmograph. The ENG record during 90 seconds was divided every 10 seconds into 9 equal parts. A number of nystagmus beats and a mean slow phase eye-speed during each 10 seconds was measured. When the measured values of the number of nystagmus beats or the eye-speed exceeded the normal values, the optokinetic nystagmus was judged to be hypernystagmus.<BR>The lesion in the cases showing the optokinetic hypernystagmus were located in the visual apparatus, the cerebral cortex, the basal ganglia, the brain-stem and the labyrinth.<BR>Furthermore, it was stated that this optokinetic hypernystagmus was different from the optokinetic hypernystagmus associated with the development of optokinetic function.
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