UV radiations (UVR) between 290 and 320 nm are called B (UVB). UVB radiations are the responsible of the most important biological effects on human beings. As for the skin, they cause it harmful effects in the short and in the long term. The reddening of the skin, from slight to large burning, is the main harmful effect in the short term. The effects in the long term are usually forgotten due to the extensive period time, which takes to show skin abnormalities. Moreover, there are no signs that warn people about their inadequate exposure to the sunlight. The most common consequences are skin cancers and premature ageing of the skin.
However, UV radiation is only a risk for the health when human beings keep on exposing themselves for years, ignoring their type of skin.
The risk caused by UV radiation goes down in proportion to the grade of natural pigmentation on human beings skin, which is maximum on very white skins and minimum on people of black skin.
About the effects of the UV radiation on the eyes, we can say that although nothing has been proved about the effects that UVB radiation can cause in the eye, there are many scientific evidences about the damage that UVB radiation can cause on the delicate ocular structure. The most common disease in the developed world is cataract. This disease is able to cause blindness. Moreover, there is no doubt about the influence of this type of radiation in its development.
Together with this, 10% of the population older than 65 in our same environment suffer an injury in the area of maximum vision denominated Maculate Degeneration, which is also linked to age. Furthermore, the ultraviolet radiation also intervenes in the degeneration.
To conclude, one of the most common ocular cancers, the so-called uvea melanoma, is dramatically increasing. Moreover, it is supposed that this fact is directly related to solar light.