Pro Nano User Manual v2.0
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9 Technical Specifications
9.1
Eye tracking specifications
The characteristics of the gaze data from an eye tracker can be described in terms of accuracy
and precision. Accuracy describes the angular average distance from the actual gaze point to the
one measured by the eye tracker. Gaze precision describes the spatial variation between suc-
cessive samples collected when the subject fixates at a specific point on a stimuli.
Eye tracking technique
Video-based pupil- and corneal reflection eye tracking with dark and
bright pupil illumination modes.
One camera capture images of both eyes for accurate measurement
of eye gaze and eye position in 3D space, as well as pupil diameter.
Sampling frequency
60 Hz
Precision*
0.10° RMS in optimal conditions**
Accuracy*
0.3° in optimal conditions
Binocular eye tracking
Yes
Total system latency
1 frame (17 ms)
Blink recovery time
1 frame (immediate)
Gaze recovery time
250 ms
Data sample output***
Timestamp
Gaze origin
Gaze point
Pupil diameter
Eye image data stream
Not available
TTL input stream
Not available
Tracker and client time
synchronization
Integrated between the eye tracker time domain and the client com-
puter time domain.
*Tobii Pro uses an extensive test method to measure and report performance and quality of data.
Please download the
Tobii Pro Nano Eye Tracker Data Quality Test Report
information.
** Using built-in filtering
*** For more information about output data and the supplementary data stream, read the
.
9.2
Setup
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Head movement
tolerance
Good. One-camera system gives an accurate calculation of the data and a
good level of precision. More sensitive to head movement than dual cam-
era systems.
Summary of Contents for Pro Nano
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