How does blinking affect eye tracking?

Blinking is most often an involuntary act of shutting and opening the eyelid. In this page we will look at the consequences of blinking on your eye tracking data. 

Blinking  is  most  often  an  involuntary  act  of  shutting and opening the eyelids. During each blink  the  eyelid  blocks  the  pupil  and  cornea  from  the illuminator resulting in raw data points missing the  x,y  coordinates  information.  During  analysis  fixation filters can be used to remove these points and extrapolate the data correctly into fixations.

Provided that the head movements are within the eye  tracker  specifications,  i.e.  that  the  missing  data points do not originate from moving the head away from the eye tracking box, it is also possible to extract information on blinks from the raw data collected by the eye tracker. This can be done by extracting it manually from the raw data exported from Tobii Studio.

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