Figure 1.

Video head impulse test (vHIT) examples with good technical quality. (A) Shows a normal video head impulse test (vHIT) with the eye movement (black, top) matching the head movement (gray, top), resulting in a gain at 55–65 ms around 1 (bottom). Head velocity is sufficient (around 150–250°/s) and there are no signs of restrictive mistakes. (B) Shows a vestibular deficit with reduced gain, covert, and overt re-fixation saccades. (C) Shows a successful calibration with the eye movements (gray dots, top) forming a cross, accumulating in the five laser points (black circles, top). In the bottom of (C) some original eye movement recordings during calibration are shown.