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The corrective saccade is always in the plane of the specific semicircular canal activated and away from the defective canal.
The video by [http://www.neurology.org/content/suppl/2011/04/03/76.14.e71.DC1/Video_1.mov Bassani] demonstrates another example of an an abnormal head impulse test in a patient with a peripheral vestibulopathy with a very obvious catch-up saccade, as well as an abnormal Unterberger-Fukuda stepping test. (6) In this video the corrective saccade is very obvious. The video depicts spontaneous right-beating nystagmus with vertical and counter-clockwise components. The nystagmus increases with gaze shift toward the pathological left side and decreases with gazing toward the right side. On the HIT, the quick rotation of the patient’s head toward the pathological left side causes an eye lag, followed by a catch-up saccade to re-fixate on the target. The last part of the video shows a 45° rotation toward the pathological left side during the stepping test.
==References==
examination more sensitive than early MRI diffusion-weighted imaging. Stroke.
2009 Nov;40(11):3504-10.
6. Bassani R. Teaching Video NeuroImages: vestibular neuritis: basic elements for
clinical and instrumental diagnosis. Neurology. 2011 Apr 5;76(14):e71.
[[Category:Neuro-ophthalmology]]