[Improvement in evoked vestibular responses by tubular vision]

Numerous factors can influence evoked or spontaneous nystagmus. In this study, the influence of reducing the visual field to a peripheral field of 18 degrees 40' was investigated in 15 subjects with normal vision. In order to reproduce the conditions of photoelectric recording with Torok's glasses, a tube was placed in front of one eye while the other eye was covered. This resulted in the enhancement of the evoked vestibular and optovestibular responses and the reduction of the subjective sensations of the subject, suggesting that the tubular vision might be helpful for the study of cinetosis. Our study also showed two culminating points and two critical phases in caloric nystagmus.