VIsualEyes 515/525 - Additional Information Page 55
Gain
Gain (%) is the ratio of maximum slow phase eye velocity to maximum head (chair) velocity. If the function of
the Vestibular Ocular Reflex (VOR) is to produce an eye movement that compensates for head movement,
then under perfect conditions the eye velocity of the response to rotation should be a mirror image of head
velocity producing a gain of 60 % (Figure 3.6.40).
Figure 3.6.40 Visual VOR Gain graph
Phase
Phase (°) displays the timing relationship between the motion stimulus and the ocular response to that
stimulus (Figure 3.6.41). Abnormal phase is associated with physiological damage to the VOR. The
magnitude of the deviation from normal correlates with the severity of damage.
Figure 3.6.41 Visual VOR Phase graph
Symmetry
Symmetry (%) indicates the presence of an imbalance in the system and helps to identify which side is
weaker (Figure 3.6.42). A normal finding would present with the data point positioned on the zero line.
Figure 3.6.42 Visual VOR Symmetry graph
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