VIsualEyes 515/525 - Additional Information Page 46
Time constant (Tc)
Time constant is the value, in seconds, that represents the amount of time it took for the response to reach
33% of its maximum SPV value.
Figure 3.6.23 Time constant graph
Time constant values are expressed in seconds (s). 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 (Figure 3.6.23). 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.
Tc symmetry
Tc symmetry provides a way to compare the time constants during chair rotations to the left with time
constants during chair rotations to the right. Tc Symmetry is calculated for per- and post-rotatory
comparisons.
Figure 3.6.24 Symmetry summary plot
Tc symmetry values are expressed as a percentage (%). 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 for Tc symmetry (Figure 3.6.24). Data points that fall
in the upper grey shaded region are suggestive of a right weakness and data points that fall in the lower grey
shaded region are suggestive of a left weakness. 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.
Graph numerical values
Exact numerical values can be obtained by tapping on or hovering over the individual data point within the
Gain, Tc, and Tc Symmetry graphs (Figure 3.6.25).
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