VIsualEyes 515/525 - Additional Information Page 37
Analysis of eye movements is performed separately for the right and left eyes and the results are displayed
separately. Left eye results are displayed by default. The displayed results can be changed to the right eye
by selecting the eye title in the top center of the summary test results screen (Figure 3.6.6).
Figure 3.6.6 Right eye results for Sinusoidal Harmonic Acceleration test
The summary test results screen displays various analyses. The top portion of the summary results screen
displays plots for Gain, Phase and Symmetry. These parameters are explained in detail in the following
section.
Phase
Phase is the value, in degrees, to which compensatory eye movements lead or lag movement of the head.
As such, phase measurements characterize the timing relationship between motion of the head and the
resulting Vestibular Ocular Reflex (VOR) response, allowing for the quantification of the phase lead or lag.
Mathematical functions are used to calculate the phase shift between the reclining chair stimulation (head
movement) and the eye response. The resulting values are plotted within the phase graph (Figure 3.6.7).
Figure 3.6.7 Phase graph
Phase values are expressed in degrees (°). A positive value indicates a phase lead. Values within the white
region of the graph are considered to be within suggested threshold levels and those in the grey shaded
regions are considered to be outside of the suggested threshold levels or criteria. When data points fall in the
grey shaded regions, the graph will be marked with a red diamond to indicate that the patient’s data was
outside of the suggested threshold level.
Phase < 0°
Eye movement lags the head movement.
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