Pro Fusion User Manual v.2.2 11
4.2 Key features
4.3 How Tobii Pro Fusion works
During tracking, eye trackers from Tobii Pro use infrared illuminators to generate reflection patterns
on the corneas of the participant’s eyes. These reflection patterns, together with other visual data
about the participant, are collected by image sensors. Sophisticated image processing algorithms
identify relevant features, including the eyes and the corneal reflection patterns. Tobii Pro Fusion is a
dual camera system that automatically chooses when to use dark or bright pupil tracking. Complex
mathematics is used to calculate the 3D position of each eyeball along with the gaze point (where
the participant is looking).
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