A fixation filter for Gazepoint GP3 HD eyetracker

The fixation logic follows the dispersion rule, if the recorded gaze points are within 1 degree gaze angle and it lasts for 100ms it is considered as one fixation.

The Gazepoint GP3 HD fixation filter cannot discern micro-saccades and it leads to problems such as recording a 40 second long fixation (which is not possible) as below.

Fixation Duration Recorded with Gazepoint GP3 HD

Fixation Duration Filtered with this filter