Pro Spectrum User Manual v2.1 19
7 Additional Features
7.1 User calibration for Tobii Pro Spectrum
Tobii Pro Spectrum calibration procedure allows for robust eye tracking research by facilitating
workflows that take into consideration your research questions, as well as the characteristics of
your participant.
Pro Spectrum supports:
l Binocular calibration
l Monocular calibration
7.1.1 Binocular calibration
The binocular calibration is successful if enough data has been collected to successfully calibrate
both eyes. Calibration results are presented for all the points in which data has successfully been
collected for both eyes. To improve a calibration, you can redo the entire calibration or recalibrate
the points for which data is missing or not good enough for your research. This is an efficient and
powerful method to calibrate your participant’s eyes, suitable for most research questions and for
most participants.
Available in:
l Tobii Pro Lab, when selecting the Calibration stimuli in the Design Timeline
l Tobii Pro SDK, when using screen-based calibration class/methods
7.1.2 Monocular calibration
Tobii Pro Spectrum’s monocular calibration functionality lets you to collect eye tracking data optim-
ized for each of the eyes of the participant. Pro Spectrum can robustly identify the left and right
eyes, irrespective if only one eye or both are visible to the eye tracking sensors. For increased con-
fidence in some cases, you could choose to cover the eye that is
not
tracked, but this is not
required.
This functionality is useful if one eye causes the binocular calibration process to fail. This could
happen, for example, due to severe strabismus, or if one eye is a prosthetic.
Separate calibration for the two eyes is also useful for research into binocular coordination and fix-
ation disparity, or in situations where you would like the calibration to pass even if only one eye
could be tracked.
Note that a default calibration is used for the eye that was not selected for calibration or that has
failed to calibrate. During the recording, Pro Spectrum will continue to search for both eyes
because it is less likely to find data for the uncalibrated eye. Nevertheless, Pro Spectrum will
report the data for the uncalibrated eye when available.
Pro Spectrum allows for two types of monocular calibration:
l Both eyes
l Only one eye – left or right
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