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With central causes of acute vestibular syndrome, it is not uncommon for the nystagmus to have a gaze-evoked component due to failure of gaze-holding circuits in the cerebellum or brainstem. In such instances, the nystagmus may reverse direction when the patient looks in the direction of the slow phase (Video 2b—direction-changing nystagmus; spontaneous left-beating nystagmus in primary and left gaze with reversal in right gaze in a patient with acute cerebellar infarction). Video 2a/b links to the open-access web site NOVEL (Neuro-Ophthalmology Virtual Education Library).
The video clips are offered in Real Media, Quicktime, and Windows Media formats. You must have the appropriate player installed on your computer to view the video. The formats available for this video are the following, ordered as they appear below: Windows Media (Non-Download), and Windows Media (Download). To download the video onto your computer for offline viewing:
1) Click on an icon with the "DL" notation
2) Right-click ( Ctrl-click on Mac ) on the red Download link when the window opens and choose "Save..." or "Download..."
3) Choose location to save in dialog box that appears.
4) Wait for file to download.
5) Now the video is stored on your computer and you can play it any time, with no Internet connection required.
To view the video without downloading to your computer, choose and click on an icon WITHOUT a "DL" notation.