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Invisible damage to uv rays: a sunburn

Time:2017-08-10 Views:161
A few days ago, I went out a little long distance, and at night, the arm of the left arm was burning hot, and I looked at it and found that I was sunburnt! In the summer of the south, ultraviolet rays are particularly fierce, and people and cars need to be protected. 
 
Ultraviolet light can cause blindness 
 
From the rays of the sun, only wavelengths from 400nm to 700nm can be perceived by humans, which we call "visible light". The wavelengths that are shorter than 400nm are not known to humans because they are closest to the violet band of visible light, so they are called "ultraviolet". These ultraviolet rays not only cause a variety of diseases, but also because they are not visible, they are often overlooked. 
 
Experts remind, summer ultraviolet is strong, not only the skin wants bask in, the eye also wants to prevent ultraviolet ray. Once the eye is damaged by ultraviolet light, it will cause eye disease such as eyelid skin cancer, keratitis, cataract. Eye experts say that ultraviolet light is invisible to the spectrum, but it is not invisible and has no harm. The wavelength of uv light is short and the energy is high, and the effect is greater. If it is not protected, ultraviolet rays from the outside of the eye enter the interior, from the cornea, the pupil, to the lens of the water, the vitreous, the retina, and so on. Some 13 million people worldwide suffer from cataracts each year, 20 percent of which are caused by uv rays, according to the data. Eye protection is a problem that everyone must pay attention to. 
 
Protective advice: 
 
How to prevent sunblock in summer? Experts suggest that reducing exposure to sun exposure and eye protection is the two main principles that prevent uv radiation from damaging the eyes. The eyes are the more fragile organs, looking directly at the sun, even if squinting at the sun for a short time may cause a temporary black shadow, and looking directly at the sun may hurt the retina. In addition, you should avoid driving long hours at the peak of ultraviolet radiation to reduce excessive sun exposure. The amount of ultraviolet excess is generally referred to between 11 a.m. and 2 p.m. 
 
In addition, a pair of high quality and suitable sun glasses is also an important tool to protect the eyes. It is important to remind you that not all the lenses are called sunglasses, and sunglasses should be labeled with UV protection. If you choose poor sunglasses that do not block the uv function, it is more likely to cause eye damage. Because the pupil dilated with this kind of sunglasses, the ultraviolet ray will be more likely to enter the eye than when not wearing sunglasses, causing eye injury. 
 
In addition to making sure sunglasses have UV protection, there are a few caveats to choose from. The lens color is not as deep as possible. In fact, the function that the sunglasses filter ultraviolet ray is only with the film that is plated. In particular, drivers who drive long distances are more likely to be tired if their sunglasses are too dark and their eyes are tired from the intense sunlight entering the tunnel. The sunglasses of all kinds of color lens are good-looking, but not all suitable for driving. Many girls like pink and purple lenses, which can change the spectrum, causing the driver to misjudge the traffic lights. As for driving, gray or dark green lenses are relatively suitable, while the tea color lenses have the effect of improving contrast, driving more appropriately in foggy, dusty environments. 
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