Snow blindness, also known as photokeratitis, is a temporary eye condition caused by the overexposure of the eyes to ultraviolet (UV) rays, typically from sunlight reflecting off snow or ice. Symptoms may include eye pain, redness, tearing, blurred vision, and a sensation of having sand in the eyes. It is important to protect the eyes with sunglasses or goggles when in snowy environments to prevent snow blindness.