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.

Related Articles

  • Eye openness

    Capturing eyelid movements can enrich psychology, neuroscience, and clinical research and improve gaze signal quality in eye tracking experiments.

  • Eye movement classification

    Learn how Tobii Pro Studio and Tobii Pro Lab classify eye movements

    Eye movement Tobii Pro Studio Tobii Pro Lab
  • Assisted mapping of gaze data for recorded with the Mobile Testing Accessory

    Mobile testing devices, such as the Tobii Pro Mobile Testing Accessory, assist you in producing eye gaze data using your mobile device as the stimuli. Together with a screen-based eye tracker and scene camera, gaze data can be acquired. The Gaze data can be mapped onto a still image (snapshot) of a webpage or app. Mapping can be done in two different ways, using manual mapping or assistive mapping. Data from a recording can be mapped onto one or several images. These images are used for generating visualizations, such as heatmaps and gaze plots, and Areas Of Interest.

    Mobile Testing Accessory eye gaze gaze pattern analysis