Gaze accuracy (Preliminary measurements)
Monocular Binocular
At ideal conditions
1)
0.5° 0.4°
At 25° gaze angle 0.5° 0.4°
At 30° gaze angle 0.6° 0.5°
At 1 lux 1.1° 0.9°
At 300 lux 0.5° 0.4°
At 600 lux 0.6° 0.4°
At 1000 lux 0.6° 0.5°
White stimuli background (300 lux) 0.8° 0.6°
Technical specifications
Tobii TX300 Eye Tracker
The characteristics of an eye tracker can be described in terms of gaze accuracy and gaze precision.
Accuracy describes the angular average distance from the actual gaze point to the one measured by
the eye tracker. Gaze precision describes the spatial variation between successive samples collected
when the subject fixates at a specific point on a stimuli. More information regarding the accuracy and
precision measurements can be found in Appendix II. A glossary can be found in Appendix I.
1)
Accuracy under ideal conditions is measured in the centre of the head movement box with the subject
fixed in a chinrest. Data is collected immediately after calibration, in a controlled laboratory environment with
constant illumination, with 9 stimuli points at gaze angles of ≤18º.
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