When you stay out in the snow too long, you might find your eyes getting painful and sensitive to light. This is due to a condition known as snow blindness, where the eye's cornea becomes inflamed due to overexposure to the ultraviolet light of the sun, reflected off the surrounding snow.
This condition is frequently experienced by those who indulge in
winter sports or live in Polar Regions. This condition is not a permanent one, and a few day's rest in a dark room will restore the eye back to its natural state.
To prevent becoming snow-blind, it is recommended that those who are likely to be exposed to conditions that cause it use a pair of sunglasses that block out 99-100% of UV rays, have 5-10% visible light transmittance and wrap-around glasses to prevent incidental exposure.
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