Abstract
In 290 patients with vertigo and 71 normal subjects, caloric nystagmus of the right and left eye was recorded separately, and the velocity of nystagmus of each eye was compared by electronystagmography.1) In 42% the patients and 30% of the normal subjects, the inward movement of caloric nystagmus of each eye was faster than the outward movement. This difference was greater near the end of the calorigram.2) This difference of velocity of each eye appeared not to be related to spontaneous or positional nystagmus.3) Of 25 subjects with spontaneous or positional nystagmus, 24 showed like convergence and only one had divergent nystagmus (near the end of caloric nystagmus one eye continued to have caloric nystagmus but the other changed to spontaneous nystagmus).These results indicate a difference of the velocity of caloric nystagmus between the right and left eyes, especially of inward movement.
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