Snow Blindness Guide

Snow blindness is an example of photokeratitis and is also known as ultraviolet keratitis and niphablepsia.  It is caused by UV radiation and by eyes becoming excessively dry with wind exposure.  It is not a permanent condition but can be very painful.  The UV rays can be reflected from snow or ice or even from the sea or sand.  The likelihood of snow blindness is exacerbated in polar-regions and at high altitude levels.  Generally speaking, it is recognised that at every thousand feet above sea level, the intensity of UV rays increases by 4%.

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