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long flights to Asia and UV exposure to pilots

Exposure to uv radiation increases approximately 5% for every 1000 feet of altitude. Both infrared (IR) and ultraviolet (uv) radiation are present in our environment, depending on the time of day, year, latitude, altitude and weather conditions and reflectivity of the surrounding surfaces, the pilot will receive more or less radiation. uv-a (400 – 315 nm), uv-B (315 – 280 nm), uv-C (less than 280 nm). Excessive or chronic exposure to uv-A, uv-B can lead to sunburn, skin cancers, cataract formation, macular degeneration. uv-C is absorbed by the ozone layer before it reaches the earth’s surface. However, with the depletion of the ozone layer, more uv may be penetrating our atmosphere. Some medical literature suggests that 100% uv protection is a wise choice for pilots especially those flying long flights from US to Asia. The FAA suggests crown glass, CR-39, neutral gray tint, 15-30% light transmittance; no polarized lenses and no transition lenses.
references:
Chorley AC et al. Civilian pilot exposure to uv and blue light and pilot use of sunglasses. Aviat Space Environ Med 2011.82(9):895-900.
Chorley AC et al. Solar Eye Protection Practices of Civilian Air Crew. Aerosp Med Hum Perform 2015: 86(11):953-961.
https://www.faa.gov/pilots/safety/pilotsafetybrochures/media/sunglasses.pdf.

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