2nd-generation RIT Wearable Eyetracker is a valuable tool for investigating
visual perception in a range of natural tasks outside the laboratory.
Based on a pair of racquetball goggles and a backpack, the wearable
eye tracker does interfere with natural eye, head, and whole-body
The custom headgear uses an infrared
illuminator, a miniature, IR-sensitive CMOS camera, and beam splitter
to capture an image of the eye. The eye is illuminated by the IR
along an optical path directed by a first surface mirror and hot
mirror. The bright-pupil image is reflected back to the CMOS camera
along the same path. A second miniature camera is located just above
the right eye and is used to capture the scene from the subjects
perspective. Slightly above the scene camera is a small laser to
be used for calibration. Finally, a battery is mounted on the left
side of the goggles to power the cameras, and also to balance the
weight of the optical components.