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Visual Fatigue Factors Associated with Night-Vision Training Among Military Pilots.

Hua Wang, Yan-Yan Zhao, Teng-Yun Wu

    Aerospace Medicine and Human Performance
    |December 8, 2025
    PubMed
    Summary

    Military pilots experience visual fatigue during night-vision training, with changes in interpupillary distance observed. Age influences the type of visual fatigue, with younger pilots showing regulation issues and older pilots experiencing convergence strain.

    Keywords:
    interpupillary distancenight-vision devicenight-vision trainingvisual fatigue

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    Area of Science:

    • Aerospace Medicine
    • Ophthalmology
    • Human Factors Engineering

    Background:

    • Accommodative dysfunction is a known contributor to asthenopia (eye strain).
    • Night-vision training presents unique challenges to visual function and quality in military pilots.
    • Understanding visual fatigue factors is crucial for optimizing training and mitigating discomfort.

    Purpose of the Study:

    • To explore factors influencing visual fatigue in military pilots during night-vision training.
    • To analyze changes in visual function and quality after using night-vision equipment.
    • To provide a basis for alleviating visual fatigue and optimizing training programs.

    Main Methods:

    • Data from 20 military pilots undergoing night-vision training was collected.
    • Visual function and quality were assessed before and after training using questionnaires.
    • Statistical analysis was performed using SPSS 25.0.

    Main Results:

    • No significant changes in refractive indexes were found post-training.
    • A significant difference in interpupillary distance was observed before and after training, particularly in pilots aged 35 and older.
    • Myopia regulation was noted in 37.5% of eyes.

    Conclusions:

    • Military pilots experience visual strain during night-vision training, with reduced interpupillary distance post-training.
    • Pilots under 35 were more prone to regulation-related visual fatigue.
    • Pilots 35 and older were more prone to convergence-related visual fatigue.