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The click-evoked vestibulo-ocular reflex in superior semicircular canal dehiscence

From the Neurology Department, Royal Prince Alfred Hospital, Sydney, Australia.

Address correspondence and reprint requests to Dr. G.M. Halmagyi, RPA Hospital, Camperdown NSW 2050, Sydney, Australia; e-mail: michael{at}icn.usyd.edu.au

The authors studied eye movement responses to loud (110dB) clicks in 4 patients with Tullio effect due to superior semicircular canal dehiscence and in 9 normal subjects, by averaging the electro-oculogram. All 4 patients had small (0.1–0.3 deg) but easily reproducible vertical vestibulo-ocular reflex eye movement responses to the clicks. Normal subjects had responses that were at least 10 times smaller. The click-evoked vestibulo-ocular reflex test is a simple, robust way to screen dizzy patients for symptomatic superior semicircular dehiscence.

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