Photokeratitis, also known as snow blindness, is a painful condition of the eyes caused by overexposure to UV rays. This eye condition can be caused by various sources of UV radiation, including tanning beds, welding torches, and exposure to sunlight reflected off snow or water. The symptoms of photokeratitis include a sensation of sand in the eyes, a brief loss of vision, and eye redness. Synonyms for photokeratitis include ultraviolet keratitis, arc eye, and welder's flash. Treatment for photokeratitis may include prescription eye drops, wearing protective eyewear, and avoiding direct exposure to UV radiation.