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addition, the faded state of photochromic glass lenses may not be clear enough to be
useful when flying in cloud cover or at night.
FRAMES. The selection of sunglass frames is probably more a matter of personal
preference than lens material or tint. The frames of an aviator’s sunglasses, however,
must be functional and not interfere with communication headsets or protective
breathing equipment. Frame styles that incorporate small lenses may not be practical,
since they allow too much visible light and ultraviolet radiation to pass around the
edges of the frame. A sunglass frame should be sturdy enough to take some abuse
without breaking, yet light enough to be comfortable. An aviator’s sunglasses should fit
well so that sudden head movements from turbulence or aerobatic maneuvers do not
displace them. Finally, use of a strap is recommended to prevent prescription sunglasses
from being accidentally dislodged, or a necklace chain can be used to allow them to be
briefly removed and subsequently replaced.
SUMMARY. While adding to the mystique of an aviator, sunglasses protect a
pilot’s eyes from glare associated with bright sunlight and the harmful effects from
exposure to solar radiation.
Lenses for sunglasses that incorporate 100% ultraviolet protection are available in glass,
plastic, and polycarbonate materials. Glass and CR-39® plastic lenses have superior
optical qualities, while polycarbonate lenses are lighter and more impact-resistant.
The choice of tints for use in the aviation environment should be limited to those that
optimize visual performance while minimizing color distortion, such as a neutral gray
tint with 15 to 30% light transmittance.
Polarized sunglasses are not recommended because of their possible interaction with
displays or other materials in the cockpit environment.
Since sunglasses are an important asset, whether or not refractive correction is required,
careful consideration should be used when selecting an appropriate pair for flying.
The technology associated with ophthalmic lenses is continually evolving, with the
introduction of new materials, designs, and manufacturing techniques.
Aviators should consult with their eyecare practitioner for the most effective alternatives
currently available when choosing a new pair of sunglasses.
References
1. La Comission Interntionale de l’Eclairage (CIE). Figures correspond broadly to the
effects of UVR on biological tissue.
2. World Meteorological Organization. Scientific Assessment of Ozone Depletion: 1994,
WMO Global Ozone Research and Monitoring Project - Report No. 37, Geneva,
Switzerland: 1995.
3. Rash CE, Manning SD. For Pilots, Sunglasses are Essential in Vision Protection,
Flight Safety Foundation Human Factors & Aviation Medicine, July-August 2002;
49(4): 1-8.
Aerospace Medical Education:
A Key to Aviation Safety
MEDICAL FACTS FOR PILOTS
Publication AM-400-05/1
Written by
Ronald W. Montgomery, B.S.
Van B. Nakagawara, O.D.
Prepared by
FAA Civil Aerospace Medical Institute
Aerospace Medical Education Division
AAM-400, P.O. Box 25082
Oklahoma City, OK 73125
To order copies of this brochure, write
to the above address, or call
(405) 954-4831
Visit our Web site to see other
topics of interest to pilots and travelers
www.faa.gov/pilots/safety

　
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