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4. Toggle threshold sliders: Allows the operator to adjust the image contrast using the appearing
scrollbars. The contrast should be adjusted so the eye tracking crosshair appears in the middle of
the pupil when the patient is looking center, up, down, left, and right. The contrast will be adjusted
automatically by default, and can be reset to automatic threshold adjustment by clicking the
icon below each slider.
5. Toggle Left Eye: Enable/disable image and eye tracking for the left eye.
Figure 3.6-3: Eye tools menu
Calibration
For all eyetracking tests, perform a calibration to ensure accurate measurements of the position of the eyes
and the velocity of the nystagmus. Calibrations are particularly important in tests where eye movements are
compared with a given stimulus of a known position and/or velocity (e.g. Saccade, Smooth Pursuit, Gaze
etc.).
NOTICE: A calibration should be performed when the goggle/camera is changed, or the goggles or cameras
are moved.
For VisualEyes™ 505, 515 and 525, a stimuli monitor/TV or projector is required to perform the calibration.
When using the Orion Comprehensive or Auto-Traverse chairs, the built-in laser will be used for the
calibration. For EyeSeeCam it is recommended to always use the laser attached on the goggle.
NOTICE: If a reclining rotary chair is used for the test, ensure that the:
•
Chair is faced toward the television screen/projection image
•
Patient is centered in front of the stimulus
•
Chair is locked to avoid unintended turns before starting the calibration
VisualEyes™ 505 and 515 do not use visual stimuli for the tests. Thus, these systems might not have the
required monitor, TV, or projector to perform the calibration. In this case, the user can skip the calibration
step for the tests by turning ON "Skip Calibration" in the Test Parameters under specific tests. The test
parameters can be found by navigating to Protocol Management, selecting a test in the protocol and clicking
"Edit Test". If the calibration is skipped, the system will use the default calibration.
The Calibration screen can be opened from the test screen, by clicking
on the "Calibration" button in the left panel. The calibration screen can
also be entered by pressing the foot switch or by clicking the right
button on the remote control when the Calibration button is highlighted
in white.
D-0134090-A – 2022/11
VisualEyes™ - Instructions for Use - EN
Page 72
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