Pro Nano User Manual v2.0
15
1. Make sure the eye tracker is attached to the monitor and connected to your computer. Open
Pro Eye Tracker Manager. For more information, read
2. By now, you should have also tested your setup as described in
3. Click the Calibrate button in Pro Eye Tracker Manager and follow the on-screen instructions.
4. Evaluate your calibration results. Large systematic errors i.e. a large distance between the
average gaze point and the target gaze point may be indicative of a configuration error. No
calibration feedback data on the targets located on the top of the screen may indicate that
there is a mismatch between the screen size and eye tracker configuration. Click the Recal-
ibrate button to improve a calibration. Click the Use Calibration button when you are satisfied
with the your calibration.
5.5.1 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 Pro Eye Trackers use an individual
calibration 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.
You can do basic calibration in Pro Eye Tracker Manager. There is more functionality, including
calibration validation, in Tobii Pro Lab.
You can find more information in the Tobii Pro Learning Center about
and
calibration and validation in Pro Lab
5.5.2 Additional information for experienced users
A participant can be calibrated with Pro Nano even when only one eye was successfully
calibrated. That calibration gets copied to the “failed” eye as well, and this might cause
poor data for that eye.
Pro Nano produces only one vector for the calibration results, thereby providing inform-
ation on the average estimated accuracy, but not on the estimated precision.
Use the Left and Right eyes results in Pro Eye Tracker Manager and Pro Lab to determ-
ine whether both eyes were calibrated successfully. You can also choose to analyze the
data only for the eye that successfully calibrated.
5.6
Detach the eye tracker
To temporarily remove the eye tracker, pull it away from the magnetic mounting plate and
leave the magnetic plate in place.
To permanently remove the magnetic mounting plate, you must remove the non-permanent but
strong adhesive that fastens your eye tracker mounting plate 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 guitar pick, or a
credit card. Use this to slide between the mounting plate and the computer bezel (or whatever it
Содержание Pro Nano
Страница 1: ...Pro Nano User Manual...