UVB rays penetrate the skin's outermost layers, causing reddening and skin cancer. Most plane windows will block UVB rays, but UVA rays can will still get through.
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Airline pilots can be exposed to the same amount of UV-A radiation as that from a tanning bed session because airplane windshields do not completely block UV-A radiation, according to research. Airplane windshields are commonly made of polycarbonate plastic or multilayer composite glass.
Sunglasses reduce the effects of harsh sunlight, decrease eye fatigue, and protect ocular tissues from exposure to harmful solar radiation. Additionally, they protect the pilot's eyes from impact with objects (i.e., flying debris from a bird strike, sudden decompression, or aerobatic maneuvers).