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Related Experiment Videos

Aircrew visors and color vision performance: a comparative and preliminary pilot study analysis.

P A Young1, J Perez-Becerra, D Ivan

  • 1USAF School of Aerospace Medicine, Brooks AFB, TX, USA.

Aviation, Space, and Environmental Medicine
|November 22, 2000
PubMed
Summary

Aircrew visors, including High Contrast Visors (HCV) and Laser Eye Protection (LEP) types, significantly impact color vision. A neutral density filter may enhance visual performance and wearer compliance.

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Area of Science:

  • Aviation Ophthalmology
  • Human Factors Engineering
  • Color Vision Science

Background:

  • Aircrew visor selection requires understanding their impact on color vision, an area with inconclusive research regarding operational use.
  • Assessing the effects of current and proposed eye protection on color perception is crucial for aircrew visual performance.

Purpose of the Study:

  • To objectively evaluate the effects of Short Wavelength Absorbing Filters (SWAFs), High Contrast Visors (HCV), and Laser Eye Protection (LEP) visors on the color vision of active duty military aircrews.
  • To compare various aircrew eye protective visors and support recommendations for an optimal visor for sun protection, visual enhancement, and compliance.

Main Methods:

  • Seven active flying status volunteers underwent color vision testing with and without seven U.S. Air Force (USAF) visors/filters.

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  • Spectral transmissions of visors/filters were analyzed to determine characteristics and potential to induce acquired color vision decrements in color-normal individuals.

    • Main Results:

    • The USAF High Contrast Visor (HCV) significantly degraded color vision compared to luminosity-matched neutral density visors.
    • Specific Laser Eye Protection (LEP) visors caused abrupt color vision decrements, supporting theoretical predictions.
    • Low transmittance neutral density visors had a minimal, non-significant effect on color vision performance.

    Conclusions:

    • Concerns about HCV and LEP visors' impact on color vision necessitate consideration of age, baseline color vision, environment, and mission factors.
    • Further research is needed to assess visor effects on recognizing color symbology on Multi Function and Electronic Flight Information Displays.
    • A mildly tinted neutral density filter (25-49% transmission) is recommended to potentially enhance visual performance and ensure normal color perception in various lighting conditions.