Teaching Video NeuroImage: Diagonal Saccade Testing Can Localize Slow Saccades

Usman F. Ashraf, Chao Wang,Gabor M. Halmagyi

NEUROLOGY（2023）

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Abstract

A 24-year-old woman presented with blurry vision. Examination showed left eye esotropia and slow horizontal saccades bilaterally. Vertical saccade velocity was normal, and there was a "round the houses" sign on diagonal saccades (Video 1). Video head impulse testing (vHIT) reduced gains in the posterior canals bilaterally with relative preservation of anterior and horizontal canal function bilaterally.

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