UVA ultraviolet radiation ozone layer

In more ways than one is great sunglasses. They can compliment your appearance, also prevent you have to squint, on a sunny day, and on the outside. But the sunglasses do not just a fashion accessories to be let down. In fact, they are mainly from the sun's ultraviolet exposure to them, with the passage of time, the eyes which may lead to diseases of the eye is important to protect our.
Ultraviolet radiation element in sunlight is divided into two basic areas - UVA and UVB. Sunglasses that block these types of ray. UVA and UVB you ask what is it? Well, UVA ultraviolet radiation ozone layer through the earth, to our skin, can lead to premature aging. UVB UV, but a large number of absorbed by the ozone layer. Even so, they are very harmful, can promote the cause of skin cancer and cataract.
In the ultraviolet protection level Sunglasses industry standard is UV400 - all - from 98% of the sun's ultraviolet rays, eye protection. Based on the test results compared to the more expensive brands from the statistical data of cheap sunglasses, even in the 5 yuan of the following range of sunglasses, to provide the same level of protection is more expensive varieties. So, the good news is, you don't have to pay more to protect the best level. And for those who wear prescription sunglasses, and some of you may be interested to know that, UV levels are those that store the same buy version.
For more comfort and assurance, you'll be glad to know, sunglass manufacturers must follow certain FDA regulations. They must obey not to say - and the impact of sunglasses must be completely not fragile, but they will be in the best case, under moderate effect. Sunglasses manufacturers have to follow labeling regulations. There is no doubt that, if you buy a pair of sunglasses in your life, you have to remove the stickers off a one in front of the lens, whether before, after you get them or, when you realize that block your view. And they said, you get what you pay for. Well, if you pay a pair of sunglasses, you pay good eye health.