Table 10. Diagnostic criteria for bilateral vestibular loss.

A. Chronic vestibular syndrome with at least three of the following symptoms:

Postural imbalance

Unsteadiness of gait

Movement-induced blurred vision or oscillopsia during walking or quick head/body movements

Worsening of postural imbalance or unsteadiness of gait in darkness and/or on uneven ground

B. No symptoms while sitting or lying down under static conditions

C. Bilaterally reduced or absent angular VOR function documented by bilaterally pathological horizontal angular VOR gain <0.6, measured by the video-head impulse test or scleral-coil technique and/or reduced caloric response on VNG and/or reduced horizontal angular VOR gain <0.1 upon sinusoidal stimulation on a rotary chair

D. Not better accounted for by another disease

VOR, vestibular-ocular reflex; VNG, Videonystagmography.