They wear sunglasses to protect their retinas from the UV light. Thigh at night the bright spot lights could damage their eyes from being in the dark so long. Ultraviolet (UV) light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than X-rays. But the UV light are not all harmful to our body. We can benefit from absorbing certain UV light because UV light can produce vitamin d and aesthetics. UV light also has its medical applications. However, excessiveness UV light is easy to cause skin cancer. And the deepest effect on body is to damage eye sight and eye nerves. UV light is absorbed by molecules known as chromophores, which are present in the eye cells and tissues, which can lead to welder’s flash, cataracts, pterygium and pinguecula formation. Miners always stay in dark and deep places in a long time, if they don't wear special eyeglasses, they'll be blind soon and catch some other eye problems.
