Quick Answer
Snow blindness is a risk when snow reflects sunlight, causing eye damage from high levels of UV radiation, and is exacerbated by high altitude, snow glare, and prolonged exposure to the sun.
Environmental Factors Contributing to Snow Blindness
High Altitude and UV Radiation
At high altitudes, the atmosphere offers less protection from UV radiation, increasing the risk of snow blindness. For every 1,000 feet (305 meters) of altitude, the UV radiation exposure increases by 10-12%. For example, at 14,000 feet (4,267 meters), the UV radiation is equivalent to 50% stronger than at sea level. When snow reflects 80-90% of incoming UV radiation, the risk of snow blindness becomes significant.
Snow Glare and Reflection
Snow glare occurs when sunlight reflects off the snow, creating a bright, blinding environment. This glare can be intense and disorienting, increasing the risk of snow blindness. To mitigate this risk, it’s essential to wear proper eye protection, such as goggles or sunglasses with UV protection, and to take regular breaks in shaded areas.
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