Ultraviolet Radiation
Sunbathing on the beach in the summer, we accept as to protect our skin from excessive exposure to sunlight, so as not to get burned. However, most of us do not know what is more important protection from the sun in our eyes. Rays of the sun – is not only our visible light, but also the invisible ultraviolet rays (UV radiation), which have harmful effects on all parts of the eye. Intense ultraviolet radiation can cause burns of the eye (photokeratitis), and prolonged exposure to uv rays increases the risk of dangerous eye diseases like cataracts and macular degeneration. To reliably protect your eyes from dangerous uv rays should be use sunglasses in conjunction with headgear. Hats with large fields or canopy greatly reduce the flow of light entering the eye. However, this is still insufficient to fully protect your eyes from uv radiation. You must use sunglasses.
It is important that sunglasses provide 100% protection from uv radiation and protects against high-energy blue-ray, as well hazardous to the eyes. Good sunglasses provide 99% protection against UV-B rays and 95% of UV-A rays. Provide better protection for glasses with a close-fitting shape, because they restrict the flow of rays, not only passing through them, but gets into eyes through his glasses. With prolonged sun exposure, use the form-fitting sunglasses. Note also that the degree of eye protection sunglasses on uv radiation does not depend on the degree of darkening lenses. 100% uv protection guarantee, many high-quality uncolored lenses. The choice of color sunglasses lenses – a matter of taste.
The most common brown, green, blue and orange. Gray preserves the natural color. From blue light better protect ophthalmic lenses of brown and reddish-copper tones. For each sport now has its own guidelines for choosing the color of lenses in sunglasses. Skiers, for example, the lenses of yellowish tones provide the best contrast. Among fishermen and water sports enthusiasts have traditionally enjoyed great popularity Sunglasses with polarized lenses, which not only protect your eyes from harmful uv rays, but also increase the visual comfort and image contrast by blocking part of the light reflected from the water. Polarized lenses enhance the quality of not only water but also on the snow in the mountains or even just on the highway because there reflected from flat surfaces of polarized light degrades the image contrast. If you are in Life always has to use spectacles (ie if you have myopia, hyperopia, or other visual defects), it provides great convenience glasses with photochromic lenses. Photochromic lenses in the room are as clear as conventional non-colored lenses, but in the open air under the action of solar uv radiation, they become almost as dark as the lens in the sunglasses. Glasses with photochromic lenses – perfect replacement of two pairs of glasses: Conventional and solar. Note that there are even photochromic polarized glass lenses, which have just two remarkable properties: they are obscured in the car, which usually do not penetrate the uv rays (Ordinary photochromic lenses "not working" in the cabin), and in addition they block the sun's rays reflected from the roadway. Sunglasses with lenses improve visual comfort and quality of the whole driver. However, when prolonged exposure under the bright sun it is better to use the sunglasses-fitting shape.
