VIsualEyes 515/525 - Additional Information Page 36
Example Instruction for the Patient:
”You will feel yourself rotating back and forth slowly in the chair. While you are rotating, I will be asking you
several questions to keep you alert. We will test different frequencies and the entire test will take a few
minutes. Please keep your eyes open the entire time.”
To begin the test:
1. Select ‘Start’ from the left menu panel.
2. The timer will begin counting down. The length of test time is pre-defined by the number of cycles
selected for the test frequency.
The chair will activate and begin moving in a sinusoidal pattern.
Camera recordings will begin at the onset of chair movement.
The stimulus and eye movements will be displayed in real-time (see Figure 1.86).
While the test is active, it is possible to add cycles to continue testing beyond the protocol-specified number
of SHA cycles. Click or touch the button to add a cycle, which will increase the
test time by the number of seconds associated with one full cycle of SHA rotation for that given frequency.
To abort the chair rotation prior to test completion, click or touch the Stop button. A message will be
displayed on the computer test screen asking “Are you sure you want to stop?”. Click or touch yes to have
the recording end. Click or touch no to continue recording the tracing.
Once the test is complete a summary test results page will appear (Figure 3.6.5).
Figure 3.6.5 Sinusoidal Harmonic Acceleration summary
Sinusoidal Harmonic acceleration analysis is performed on cycles of pendular movement for specific
frequencies. One complete cycle represents the pendular movement period consisting of
acceleration/deceleration in one direction, and acceleration/deceleration in the opposite direction.
Please note: The first half cycle (hatched region) is excluded from the analysis for improved test
reliability.
To Next Page
Loading...
