Arc eye is a medical condition that occurs when the eyes are exposed to intense ultraviolet light or infrared rays. It often occurs in welders who do not properly protect their eyes from the welding arc. Synonyms for this condition include welder's eye, flash burn, photokeratitis, UV keratitis, and welder's keratitis. These terms all refer to the same eye injury, which can cause symptoms such as redness, pain, sensitivity to light, and tearing. Treatment for arc eye typically involves resting the eyes, using eye drops or ointments to relieve pain and inflammation, and wearing protective eyewear to prevent further damage.