RELATIONS BETWEEN VESTIBULAR NYSTAGMUS AND VISUAL PERFORMANCE.

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Abstract
Rleation-ships between vestibular nystagmus and visual acuity were measured during application of different magnitude vestibular stimuli which interfered with voluntary efforts to see visual detail in controlled illumination. Significant relations were found among vestibular stimulus magnitude, nystagmus, and visual acuity. During illumination, nystagmus growth and decay curves depart markedly from curves found in darkness and from theoretical expectations. Steps in mystagmus slow phase velocity appear to be related to steplike shifts in visual acuity while steps in nystagmus amplitude seem to signify the point of surrender of voluntary efforts to maintain clear vision. Step-changes in nystagmus may explain the physiological 3rd stage of spin reported in jet aircraft. Individual differences in Dynamic Visual Acuity-Vestibular are discussed in relation to Dynamic Visual Acuity and also in relation to flight safety.

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