<unk>  is a painful condition, typically a keratitis, caused by exposure of unprotected eyes to the ultraviolet (UV) rays in bright sunlight reflected from<unk>  or ice. This is especially a problem in polar regions and at high altitudes, as with every thousand feet increase in elevation, the intensity of UV rays goes up five percent.
The problem is also related to the condition arc eye sometimes experienced by welders.<unk>  is akin to a sunburn of the cornea and conjunctiva, and may not be noticed for several hours from exposure. Symptoms can run the gamut from eyes being bloodshot and teary to increased pain, feeling gritty and swelling shut. In very severe cases,<unk>  can cause permanent vision loss.
The Inuit carved goggles from caribou antler to help prevent<unk> . The goggles were curved to fit the user's face and had a large groove cut in the back to allow for the nose. A long thin slit was cut through the goggles to allow in a small amount of light. The goggles were held to the head by a cord made of caribou sinew.
Snow blindness
Mind's eye
Black eye
Color blindness
Red eye 
Red eye
Red eye  
Bothnia retina dystrophy