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04/12/2015 at 16:50 #3870
Tobias Lindgren [Tobii]
Exactly how the pupil diameter is calculated differs between different eye tracker models but in general the pupil diameter calculation should compensate for different gaze angels and there should be no substantial fluctuations. But as always I suggest that you make some test recordings and make sure you are able to extract the data and conclusions you want before recording a large number of subjects.