Tobii Pro Spark - 10 Technical Specifications; 10.1 Eye Tracking Specifications; 10.2 Setup Specifications

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10 Technical Specifications
10.1 Eye Tracking Specifications
Eye tracking technique
Video-based Pupil Center Corneal Reflection (PCCR) eye
tracking with dark and bright pupil illumination modes.
1
One camera captures 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 (default) or 33 Hz
Precision
0.26° RMS (ideal conditions
2
)
Accuracy
0.45° (ideal conditions)
Binocular eye tracking
Yes
Eye tracker latency
1 frame (immediate)
Blink recovery time 1 frame (immediate)
Gaze recovery time
50 ms
Data sample output
3
Timestamp
Gaze origin
Gaze point
Pupil diameter
Eye openness data stream
Not available
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
computer time domain.
1
Each data sample is based on a combination of images using both dark and bright pupil illumination.
2
Using built in filtering
3
For more information about output data and the supplementary data stream, read the Tobii Pro SDK documentation.
10.2 Setup
Head movement tolerance
*
Good. One-camera system provides an accurate calculation of
the data and a good level of precision.
Freedom of head movement
*
(at 50 cm distance)
Width x height: 20 cm x 20 cm (7.9'' x 7.9'')
(At least one eye tracked)
Freedom of head movement
*
(at 65 to 80 cm distance)
Width x height: 35 cm x 35 cm (13.8'' x 13.8'')
(At least one eye tracked)
Operating distance (mounted
on screen)
45 to 95 cm (29'' to 37'') from the eye tracker
Optimal screen size
27” (16:9 aspect ratio)
* Describes the region in space where the participant can move their head and still have at least one eye within the eye
tracker’s field of view (track box) at the specific distance.