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  4. Snow blindness arises due to

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Q. Snow blindness arises due to

NTA AbhyasNTA Abhyas 2020Environmental Issues

Solution:

UV radiation of wavelengths shorter than UV-B, is almost completely absorbed by Earth’s atmosphere, given that the ozone layer is intact. But, UV-B damages DNA, and mutation may occur. It causes aging of the skin, damage to skin cells, and various types of skin cancers. In the human eye, cornea absorbs UV-B radiation, and a high dose of UV-B causes inflammation of the cornea, called snow-blindness, cataract, etc. Such exposure may permanently damage the cornea.