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29 Jan 2009 18:50:22 IST

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snow blindness

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snow blindness

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Ankit

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29 Jan 2009 19:17:36 IST

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Snow blindness (also known as ultraviolet keratitis, photokeratitis or niphablepsia) is a painful eye condition, caused by exposure of unprotected eyes to the ultraviolet (UV) rays in bright sunlight reflectedfrom snow or ice or less commonly from sea or sand.^[1] This is especially a problem in polar regions and at high altitudes,^[2] as with every thousand feet (approximately 305 meters) of elevation (above sea level), the intensity of UV rays increases by four percent.^[3]

Snow blindness is akin to a sunburn of the cornea and conjunctiva, and may not be noticed for several hours after exposure. Symptoms can run the gamut from eyes being bloodshot and teary to increased pain, feeling gritty and swelling shut. In very severe cases, snow blindness can cause permanent vision loss.

for mor refer to :http://en.wikipedia.org/wiki/Snow_blindness

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