Eye tracker data output
Different applications can be connected as clients to the eye tracker system over TCP/IP (LAN
connector) to gather eye gaze data in real-time and to perform calibrations (and other actions).
Examples of applications that can be used together with the eye tracker include the Tobii Studio
TM
analysis software, third party analysis products such as E-Prime, or your own custom written software
for analysis, gaze-contingent applications, or eye control applications. For more information on how
to create your own applications, please refer to the Tobii Software Development Kit (SDK) product
description.
Below you can find a list of all data that can be accessed through the output of the eye tracker. In
Tobii Studio
TM
analysis software this data can be accessed through a Raw data text export function,
and easily imported into a spreadsheet for further analysis.
Timestamp Timestamp in milliseconds for when the gaze data was collected
Gaze PointXLeft Horizontal screen position of the gaze point for the left eye
GazePointYLeft Vertical screen position of the gaze point for the left eye
CamXLeft Horizontal location of the left pupil in the camera image (0 is left edge, 1 is right edge)
CamYLeft Vertical location of the left pupil in the camera image (0 is top, 1 is bottom)
DistanceLeft Distance from the eye tracker to the left eye. The distance is given in mm on a straight axis right out
from the eye tracker plane
PupilLeft Size of the pupil (left eye) in mm. The distance and pupil size measures are calculated to be as close
to real values as possible. However, individual differences in the eyes of subjects and the strength of
glasses/contact lenses will cause errors in these values. The measures still reflect changes in head
position and pupil size accurately.
ValidityLeft Validity of the gaze data. The validity is 0 if the eye is found and the tracking quality good. If the eye
cannot be found by the eye tracker the validity code will be 4. Read more under the Validity codes
section further down
Gaze PointXRight The horizontal screen position of the gaze point for the right eye
GazePointYRight Vertical screen position of the gaze point for the right eye
CamXRight Horizontal location of the right pupil in the camera image (0 is left edge, 1 is right edge)
CamYRight Vertical location of the right pupil in the camera image (0 is top, 1 is bottom)
DistanceRight Distance from the eye tracker to the right eye. The distance is given in mm on a straight axis right
out from the eye tracker plane
PupilRight Size of the pupil (right eye) in mm. The distance and pupil size measures are calculated to be as
close to real values as possible. However, individual differences in the eyes of subjects and the
strength of glasses/contact lenses will cause errors in these values. However, the measures still
reflect changes in head position and pupil size accurately
ValidityRight Validity of the gaze data. The validity is 0 if the eye is found and the tracking quality good. If the eye
cannot be found by the eye tracker the validity code will be 4. The value is for the right eye. Read
more under the Validity codes section further down
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