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Figure 3.7-1: Calibration screen
After entering the calibration screen, the operator should ensure that the source and stimuli are selected
properly. This is done by first selecting the source in the drop down selection menu (1 in
), and
Figure 3.7-1
afterward selecting the stimuli in the drop down selection menu (2 in
).
Figure 3.7-1
Center the calibration stimulus for the patient using the target center slider (3 in
). Vertical tests will
Figure 3.7-1
still display the target from the center of the screen, but horizontal tests will display the target centered at the
target center position specified by the target center slider. If using the Auto-Traverse or Comprehensive
chairs, the target can be adjusted by manually adjusting the laser on the back of the chair.
If the patient distance differentiates from the patient distance entered in System Default Settings, this can
quickly be adjusted for the specific calibration by entering the Advanced Settings (6 in
). From here
Figure 3.7-1
the target size can also be adjusted, if for instance the patient is visually impaired and not able to see the
default target size.
Start the calibration by pressing "Start Calibration" (4 in
). Refer to the instructions in sections
Figure 3.7-1
3.7.1-3.7.4 for performing the calibration.
If you cannot complete the calibration, use the default calibration by clicking "Use Default Calibration" (5 in
). The default calibration settings only provide an approximate calibration value. Be aware that
Figure 3.7-1
results for oculomotor tests and nystagmus velocities need to be interpreted with caution.
Further calibration details can be presented in either graphical or tabular form by pressing "Calibration
Details" (7 in
).
Figure 3.7-1
3.7.1 Standard calibration
The standard calibration is a 5-point calibration, where the patient is instructed to hold their head still facing
the stimuli screen, and look at each of the 5 targets as they appear on the stimuli screen. The calibration
screen will show a large yellow dot representing the current target point that the patient is looking at. The
software will by default automatically accept the fixation points after a few seconds and move on to the next
target. Automatic fixation detection may not be achieved successfully in some patients. In such cases,
clicking the "Accept point" button will manually accept the value and move to the next target position. When a
D-0134090-A – 2022/11
VisualEyes™ - Instructions for Use - EN
Page 73
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