The energy gained by all living things it is sunlight. Sunlight is needed for the survival of all creatures in addition to its function to illuminate / light the entire earth, but in some corridors there are also bad effects for living things. Where in the sun, there are several types of rays which of each type of light that have a different effect on the lives of living beings, one of which is the Ultraviolet (UV).
UV region covers the wavelength range of 100-400nm and is divided into three bands:
1. UVA (315-400nm)
2. UVB (280-315nm)
3. UVC (100-280nm)
Ultraviolet light hazards to the eye:
UV radiation on the eye will cause an oxidation reaction at the eyepiece will cause cloudiness in the lens so that arose disease called cataract, also damage to the cornea and retina. Ultraviolet rays can also cause wrinkles on skin and eye cancer.
Depletion of the ozone layer is likely to exacerbate existing health effects caused by exposure to Ultraviolet radiation, as stratospheric ozone is a very effective absorbed of Ultraviolet radiation. As the ozone layer becomes thinner, the protective filter provided by the atmosphere decreases. As a result, humans and the environment are exposed to UV radiation levels are higher, and particularly higher levels of UVB that have the greatest impact on the health of humans, animals, marine organisms and plant life.
The many activities that we do in the outdoors and in direct sunlight, has a bad risk to the eye, such as cataracts, corneal problems and other eye problems caused by age.
A study showed that the use of sunglasses beneficial for eye health, among others, to help reduce glare in your eyes, protect your eyes from the dangers of ultraviolet rays, and reduce the contrast.
"To prevent permanent damage to the eye, should all people, both adults and children
use sunglasses or a hat," he said. To be more effective, both must be worn when you go outdoors for long periods of time.