Related Experiment Video
Updated: Aug 1, 2026
03:49
Evaluating Flight Performance and Eye Movement Patterns Using Virtual Reality Flight Simulator
Published on: May 19, 2023
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
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.
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.
- 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.
