What Calibration Does; Detach The Eye Tracker - Tobii Pro Spark User Manual

You can toggle on and off Gaze Visualization in the upper left corner of the Calibration
Results window (or on the Overview tab). This can be used to confirm the participant's
calibration results.
6.5.1 What calibration does
The human eye shows a natural individual variation in its shape and geometry. For example, the
exact location of the fovea, the area responsible for the part of the visual field that we perceive in
focus and full color, varies from individual to individual. Tobii eye trackers use an individual cal-
ibration procedure to optimize their gaze estimation algorithms (i.e., the 3D eye model) and
account for this variation. The end result of this optimization is a fully customized and more accur-
ate gaze point calculation. Additionally, some Tobii eye trackers use the calibration procedure to
select the detection mode (e.g. dark or bright pupil tracking) that provides the most accurate data.
You can do basic calibration in Tobii Pro Tobii Pro Eye Tracker Manager. There is more func-
tionality, including calibration validation, in Tobii Pro Lab.
For more information, read the articles on eye tracker calibration and on how to calibrate and val-
idate in Tobii Pro Lab.
6.6 Detach the eye tracker
To temporarily remove the eye tracker, gently pull it away from the magnetic mounting bracket
and leave the bracket in place.
To permanently remove the mounting bracket, you must remove the non-permanent but strong
adhesive that fastens your eye tracker mounting bracket to the screen bezel. Since it is fairly
strong, you may not be able to take it away with only your fingers. If you want to remove it, we
recommend using something very thin such as dental floss or a thin thread, a plastic guitar pick,
or a credit card. Use this to slide between the mounting plate and the computer bezel (or
whatever it is attached to). As you slide it behind the mounting plate, gently bend the mounting
plate towards you so that it detaches.
The mounting bracket adhesive should be removed carefully. If placed over a man-
ufacturer logo on the bezel, removing the mounting bracket could damage the logo.
You can purchase additional mounting plates. For more information contact your Tobii sales rep-
resentative or authorized reseller for assistance.
Tobii Pro Spark User Manual v. 1.2 21