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2.20 The test-retest reliability, sensitivity and specificity of an eye-tracking device for sideline concussion testing
  1. Kimberly Harmon1,
  2. Bridget Whelan1,
  3. Douglas Aukerman2,
  4. Adam Bohr3,
  5. Heather Elkington2,
  6. Marissa Holliday3,
  7. Sourav Poddar1,
  8. Matthew McQueen3,
  9. Matthew Nerrie1,
  10. Sourav Poddar3,
  11. Matthew McQueen3
  1. 1University of Washington, Seattle, USA
  2. 3University of Colorado, Boulder, USA
  3. 2Oregon State University, Corvaillis, USA

Abstract

Objective To assess the test-retest reliability and the sensitivity/specificity of smooth pursuit assessments using a commercially available product (EYE-SYNC®) that records eye-tracking as radial and tangential variance while the athlete wears a google device.

Design Prospective, case-control.

Setting Three NCAA Division I universities.

Participants Varsity athletes.

Interventions (or Assessment of Risk Factors) Athletes were given a preseason baseline test of smooth pursuits using EYE-SYNC®. When an athlete presented acutely with a suspected concussion, (sideline or within 24 hours) a battery of tests were performed including the EYE-SYNC® smooth pursuits. If a concussion was clinically diagnosed, a teammate control was identified based on co-morbid conditions (attention deficit disorder, learning disability, migraine headache disorder, mood disorder) and school year and the EYE-SYNC® smooth pursuit test was performed.

Outcome Measures EYE-SYNC® smooth pursuit test.

Main Results Baseline and post-injury data were collected on 33 concussed athletes and 33 matched-controls. Athlete were predominantly male (24, 73%) with a sport distribution of football (18, 55%), softball (6, 18%), women’s/men’s basketball (2 each, 6%), women’s basketball, cheer, baseball (2 each, 6%), volleyball, women’s/men’s soccer, gymnastics, baseball (1 each,3%). The test-retest reliability (ICC) for tangential variability was 0.71 and radial variability 0.47 (average 363.3 days between assessments). The sensitivity and specificity for any increase in tangential variability was 48%/58%, and any increase in radial variability was 52%/61%.

Conclusions Change in tangential variability, but not radial, on EYE-SYNC® smooth pursuits has fair test-retest reliability but neither should be used in isolation to diagnose concussion.

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