Validity of low-resolution eye-tracking to assess eye movements during a rapid number naming task: performance of the eyetribe eye tracker.

The study included only healthy adults, not athletes with acute or symptomatic concussion, so it does not show how the EyeTribe would perform in the people it was meant to screen. Participants were a convenience sample of 30 people, and those who needed glasses to see the tablet were excluded, so the findings may not apply to typical sideline testing. Testing was done under ideal laboratory conditions with seated stabilization, but sideline testing would involve head movement, glare, poor attention, and less controlled setup. EyeTribe calibration was difficult, and signal loss occurred often, especially when participants looked at the lower half of the screen. EyeTribe total King-Devick times relied on the administrator starting and stopping each card, so the time difference between devices is not a clean comparison. The 60 Hz EyeTribe testing included only 11 participants, and only 8 of those 11 were successfully calibrated at that rate.

Publication types list NIH extramural and non-U.S. government research support, but the supplied text gives no author conflict-of-interest declaration.

Do not conclude that the EyeTribe is ready for sideline concussion screening. It was tested only in healthy adults under ideal laboratory conditions, and its eye movement traces were inaccurate compared with the EyeLink system.