Pro Fusion Product Description v2.3
10
2 Technical Specifications
2.1
Eye tracking specifications
Eye tracking technique
Video-based pupil- and corneal reflection eye tracking with dark
and bright pupil illumination modes.*
Two cameras capture stereo images of both eyes for robust
accurate measurement of eye gaze and eye position in 3D
space, as well as pupil diameter.
Sampling frequency
60, 120, & 250 Hz or 60 & 120 Hz, depending on the hardware
version
Precision**
0.04° RMS at optimal conditions***
0.2° RMS in optimal conditions (raw signal)
Accuracy**
0.3° in optimal conditions
Binocular eye tracking
Yes
Total system latency
3 frames (<12 ms at 250 Hz)
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
Eye image data stream frequency is approximately 4 Hz (one
image per eye). Zoomed-in eye images available in tracking
mode. Full-frame camera images are available in gaze recov-
ery mode.
TTL input stream
Not Available
Tracker and client time syn-
chronization
Integrated between the eye tracker time domain and the client
computer time domain
* Dark pupil tracking is supported in all sample frequencies. Bright pupil tracking mode is sup-
ported at 60 and 120 Hz.
** Tobii Pro uses an extensive test method to measure and report performance and quality of
data. Please download the
Tobii Pro Fusion Eye Tracker Data Quality Test Report
detailed information.
*** Applying Savitzky-Golay filtering (settings listed in the
Tobii Pro Fusion Eye Tracker Data Qual-
).
**** For more information about output data and the supplementary data stream, read the
.
