Ultraviolet rays hurt the eyes
Snow blindness is a kind of mountain sickness. In addition to large areas of snow, strong sunlight is also a condition for snow blindness. The snow has a strong reflectivity to the sun, and the new snow that has just reflected the sun can reach 95%. When the human eye looks at the snow, it can be considered to directly look at the sun with the naked eye. know. The cornea and conjunctival epithelial cells are necrotic and detached by ultraviolet rays for a long time, which in turn causes corneal opacity and blurred vision. In addition, in some places, the snow is not flat, but a plurality of concave surfaces are formed. Such a place can reflect more intense sunlight, so sometimes even on a cloudy day, staying in the snow for a long time without protection can cause Temporary blindness of the eyes. Although after a few days of rest, the vision can be restored on its own, but those who have experienced the snow blind will be blind again if they are not paying attention, and the symptoms will be more serious than before. Repeated snow blindness can cause irreversible damage to the human eye, causing vision weakness and other eye diseases, and can also cause damage to the macular area of the fundus, severe or even permanent blindness.
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