[Ans] What is snow blindness? Inability to see during a blizzard Burns caused by snow in the eyes Eye irritation caused by UV exposure Ice crystals in the eyes

Step 1 : Introduction to the question "What is snow blindness?"

...Photokeratitis or ultraviolet keratitis is a painful eye condition caused by exposure of insufficiently protected eyes to the rays from either natural (e.g. intense sunlight) or artificial (e.g. the electric arc during welding) sources. Photokeratitis is akin to a sunburn of the cornea and conjunctiva, and is not usually noticed until several hours after exposure. Symptoms include increased tears and a feeling of pain, likened to having sand in the eyes.

Step 2 : Answer to the question "What is snow blindness?"

Eye irritation caused by UV exposure:

Snow blindness is a painful eye condition caused by exposing the eyes to ultraviolet (UV) rays reflecting off snow and ice. It is particularly prevalent at high altitude, and severe cold and dryness exacerbates it. The symptoms include blurry vision, pain, swelling and watery eyes, and they may not be apparent until some time has passed after exposure, much like a sunburn. Snow blindness is preventable by wearing sunglasses or goggles that block UV rays. Source: AAO.org

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