Eye tracking specifications (Preliminary measurements)
Sampling Sampling rate (binocular) 300 Hz
Sampling rate variability 0.3%
Latency Processing latency 1.0 - 3.3 ms
Total system latency <10 ms
Timestamp precision Via sync-out port <0.1 ms
As specified in each data sample Std dev 40 µs
Time to tracking recovery For blinks Immediate
After lost tracking 10 - 165 ms
Head movement Freedom of head movement at 65 cm
(width x height)
37 x 17 cm (15 x 7’’)
Operating distance
(eye tracker to subject)
50-80 cm (20-31’’)
Max head movement speed 50 cm/s (20’’/s)
Max gaze angle 35°
Tracking technique Dark pupil tracking
Gaze precision (Preliminary measurements)
Monocular Binocular
With Stampe filter
1)
0.06° 0.04°
Without filter 0.22° 0.15°
1)
Stampe (Behavior Research Methods, Instruments & Computers, 1993, 25 (2), pp.137-142) describes
a noise reduction filter commonly used for eye tracking data. In these measurements, the Stampe stage 2
algorithm has been applied.
A glossary can be found in Appendix I.
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