Screen setup
If you have purchased the VORTEQ™ Assessment or Functional Assessment bundle, you will be able to perform the Gaze Stabilization Test (GST). GST is an assessment of the vestibulo-ocular reflex (VOR) in response to functional head movements. It is often paired together with the Dynamic Visual Acuity (DVA) or Functional Vision Head Impulse test (fvHIT™) to provide a starting point for rehabilitation.
For this test, the patient will move their head at different speeds but the optotype will always stay the same size, which has been determined from their static acuity score.
Select the Optotype Stimuli display source and set the screen size and patient distance in the System Default Settings before beginning the first test. A suggested patient distance will be identified for your screen dimensions. If the distance is too much for your room setup, then choose a smaller display input.
The default protocol is automatic, but you can also choose a manual target presentation. You can choose the options in Summary Parameters.
The default starting head speed is 70 degrees per second (Figure 4), but you can adjust that if needed.
The metronome should be “ON” to give the patient feedback on how fast to move their head. The metronome sound will stop after each optotype appears to give the patient time to enter their response with the remote control. The sound will start again when they move their head.
Select Gaze Stabilization from your default protocol if you have already set it up. If not, you can add it from the subtest menu for VORTEQ™ Assessment or Functional Assessment tests.
Make sure you have attached the sensor to the headband and turned it on.
