to penetrate the earth's atmosphere

Today many people know, a person's health, risk of long time exposure to sun light. Skin cancer is probably the most prominent, such conditions. Although it is less known risk, the sun on their eyesight. What makes it even more dangerous is the fact, you don't have to look straight at the sun that damage begins to take shape. This is because the damage to the eyes is less extreme ultraviolet radiation light itself, more to do
Not only does the sun heat generation, but also the radiation. The most harmful rays called Earth before reaching the UV filter. UVA and UVB are those with UVB more dangerous, because the two to penetrate the earth's atmosphere which can change the living organism DNA. UVA is responsible for skin diseases and vision problems. The ozone layer is not the earth, as the earth's solar radiation protective sleeve with the help of gradual depletion.
Unfortunately, by ultraviolet radiation on the eyes and cause damage is permanent. Therefore, to avoid the contact is the best way. Injury to the cornea, retina, iris injury, cancer of eyelid and eye, cataract development, all the potential impact under ultraviolet irradiation. On the eye injury is unfortunate thing may take years to the actual display and realize it at the time, there may be a few people can do to reverse the effects of.
One of the most effective methods to deal with the radiation effect is the use of sunglasses. However, in sunglasses, it is important to an understanding of the special circumstances, during this period, they should wear sunglasses. For example, contrary to the expectations of many people, is the most warm climate is not always the most dangerous environment, as far as possible, ultraviolet radiation
Sweet green in the tropics, even through closer to the poles temperature above, do not pose a risk as much as possible vision. The reason for this is that: the surface radiation. This is the frequency and extent of hook snow, because the snow reflectance than almost any other surface ultraviolet radiation.