TOBII PRO SPECTRUM

Eye tracking technique

Binocular bright and dark pupil tracking.
Two cameras capture stereo images of both eyes for accurate measurement of eye gaze and eye position in 3D space, as well as pupil diameter.

Sampling frequency

60, 120, 150, 300, or 600 Hz (max. frequency depends on hardware version)

Sampling frequency variability

Less than 0.3% of selected sampling frequency

Accuracy*

Approx. 0,4° at 65 cm

Precision*

Approx. 0,1° at 65 cm

Max. gaze angle

30°

Freedom of head movement

Width x height: 34 cm x 26 cm at 65 cm (13.5” x 10” at 26”). (At least one eye tracked)

Operating distance

55 to 75 cm (22” and 30”) from the eye tracker reference point

Total system latency

Less than 5 ms at 600 Hz

Blink recovery time

1 frame (immediate)

Gaze recovery time

Less than 150 ms

Recommended monitor

Supplied 23.8″ monitor

Data output (for each eye)

Timestamp
Gaze origin
Gaze point
Pupil diameter

Eye image data stream

Eye image stream frequency is approximately 30 Hz.
Zoomed-in eye images available in tracking mode.
Full-frame camera images are available in gaze recovery mode.

TTL input stream

8–bit timestamped data (256 event codes)
Event driven detection with a timestamp accuracy of 50 µs

Tracker and client time synchronization

Integrated synchronization between the eye tracker time domain and the client computer time domain with an accuracy of 100 µs.