VIsualEyes 515/525 - Additional Information Page 49
Figure 3.6.31 Review individual Step Rotation segment
3.6.4 VOR suppression test
During VOR Suppression, the patient is rotated in the same sinusoidal alternating pattern as in the SHA test,
but this time with a fixation light illuminated within the VisualEyes™ VNG goggles so as to assess the
patient’s ability to suppress the Vestibulo-Ocular Reflex (VOR) while rotating.
The available test frequencies are octave frequencies from .01 Hz up to .64 Hz. By comparing the patient’s
vision-denied SHA results to the VOR suppression results at the same frequency of rotation, a percentage of
gain reduction can be calculated. A failure to sufficiently suppress the VOR can be an indicator of possible
central pathology.
Eye movements are recorded with the VisualEyes™ VNG cameras and the responses are displayed in real-
time. The patient’s eyes, along with eye position tracings (°), eye velocity tracings, and two graphs for gain
(%) and reduction (%) are visible during the testing procedure (Figure 3.6.32).
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