Optomotor nystagmus is the prototype of nystagmus, and what is called “optomotor nystagmus” is the
out of mind eye-movement that some moving objects are cast on the retina as a static image. This eye-movement is influenced in the presence of labyrinth. This “influence” itself is the true vestibulo-oculomotor reflex, that is, labyrinthine reflex which appears in the eye-movement. It is possible to observe nystagmus by caloric test and rotatoric test, but the nystagmus so observed is not “catching the moving in a static form”. The examinee becomes unable to catch
even a static body in a normal form, and is troubled with ataxy and vertigo. In other words, these methods which have been of significance as the test method of vestibular function are simply to observe the nystagmus of labyrinthine origin, i. e., labyrinthine nystagmus, but never to reveal the true labyrinthine
reflex.The
concentric dual revolving apparatus is an epoch-making, unique apparatus originated by the author, by which it is possible to quantitatively determine labyrinthine reflex, with the effect of labyrinth stimulation by revolving angular accelerated velocity on the above-mentioned optomotor nystagmus as the indicator. This method can be a new, reasonable means for the study of ves tibular function. The new findings of nystagmus obtained by the author through this method are described in the present paper.
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