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ESTABLISHING NORMATIVE CHANGE VALUES IN VISUAL ACUITY LOSS DURING THE DYNAMIC VISUAL ACUITY TEST.

Chris Marquez1, Monica Lininger1, Scot Raab1

  • 1Northern Arizona University, Flagstaff, AZ, USA.

International Journal of Sports Physical Therapy
|May 19, 2017
PubMed
Summary

Dynamic visual acuity (VA) testing in NCAA football players reveals a decline in vision during head movements. This loss may indicate vestibular-ocular reflex (VOR) impairment, aiding in concussion diagnosis and return-to-play decisions.

Keywords:
ConcussionVestibulo‐ocular reflexoculomotor measures

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Area of Science:

  • Sports Medicine
  • Neuroscience
  • Ophthalmology

Background:

  • Dynamic Visual Acuity Testing (DVAT) assesses the Vestibulo-Ocular Reflex (VOR), crucial for vision during head movement.
  • Normative data for VA loss in NCAA football players under dynamic conditions is currently lacking.
  • DVAT may help identify VOR impairment, impacting concussion management and return-to-play protocols.

Purpose of the Study:

  • Establish normative VA mean scores in static and dynamic head postures using DVAT.
  • Assess VA at a head speed of 150 deg/s in pitch and yaw planes.
  • Provide baseline data for NCAA football players' visual function.

Main Methods:

  • A descriptive study utilizing diagnostic tests.
  • Sixty-seven NCAA Division I football players underwent static VA and DVAT assessments.
  • VA was measured during 20-degree rotations in pitch and yaw planes at 150 deg/s.

Main Results:

  • Static VA was -0.232 ± 0.109 logMAR.
  • Dynamic VA was 0.0845 ± 0.159 logMAR (pitch) and -0.007 ± 0.141 logMAR (yaw).
  • Mean VA loss was 0.317 ± 0.140 (pitch) and 0.227 ± 0.133 (yaw) at 150 deg/sec.

Conclusions:

  • Visual acuity diminishes significantly during head movements at 150 deg/sec.
  • VA loss exceeding baseline norms may suggest VOR dysfunction, particularly after head trauma.
  • DVAT at 150 deg/sec shows potential for identifying concussions and their effects.