chapter  8
20 Pages

Pupil Dilation and Eye Tracking

A video-based eye-tracker (e.g., the mobile Eyelink II or Eyelink Remoteof SR Research, Osgoode, Ontario, Canada) uses video cameras to recordthe eye position of human subjects, and hence record pupil dilation and eye movements. The eye-tracker puts video cameras and infrared illuminators in front of the eye to record the position of the eye, cornea reflections, and the size of the pupil. Using the movements of one’s pupil (with respect to cornea reflections), the eye-tracker tracks the movement of one’s eyes, which is then mapped into locations on the screen by calibration and adjustments for head movements.