A Comparative Study of Vestibular Performance in Pilot and Non-Pilot Service Members in Naval Aviation

Area of Science:

• Vestibular system function
• Human performance in aviation
• Oculomotor control

Background:

• The vestibulo-ocular reflex (VOR) is crucial for gaze stability during head movements.
• Impaired VOR can lead to symptoms like blurred vision and dizziness.
• Dynamic visual acuity (DVA) quantifies VOR function during head motion.

Purpose of the Study:

• To evaluate dynamic visual acuity (DVA) in rotary wing Naval aviators compared to non-pilot personnel.
• To explore the relationship between flight hours and DVA in pilots.
• To assess demographic factors influencing DVA.

Main Methods:

• 96 participants (58 pilots, 38 non-pilots) completed a computerized DVA assessment.
• DVA measured during static and dynamic head movements exceeding 180 deg/sec.
• Statistical analyses included independent t-tests, chi-square tests, and linear models.

Main Results:

• Pilots demonstrated significantly better DVA than non-pilots (0.15 LogMAR vs. 0.22 LogMAR).
• Static visual acuity was strongly correlated with DVA, but age was not.
• Flight hours in pilots did not correlate with DVA performance.

Conclusions:

• Rotary wing Naval aviators possess superior DVA, potentially due to occupational demands or selection processes.
• DVA is a key metric for assessing vestibular health and pilot performance.
• Further longitudinal studies are recommended to track DVA changes over careers and after vestibular injuries.