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By now, everyone pretty much is aware of how harmful UV rays can be for your skin. Did you know that they are also harmful for your eyes as well? Exposure to UV lighting can cause a rare form of melanoma that affects the eyes. This cancer often leads to blindness and even death. Polarized sunglasses, which is a method that is used to block out glare. Most people have a problem seeing in the bright light of the sun. This can interfere with whatever you are doing. If you are doing anything outdoors when the sun is at its brightest, you understand how important it is to have a pair of polarized sunglasses that will block the glare out. This is not just for the sake of convenience. If you are doing something that can endanger your life as well as the lives of others, you need polarized sunglasses. How polarized sunglasses work? Polarization is like a filter. They filter out the glare from the sun. They enable you to see clearly without the glare of the sun bothering you as you go about your business outside. The filter that is put on the sunglasses is a polarized filter that actually reflects the sun glare away from the glasses as well as your eyes. It not only makes it easier to see, but also is less harmful on your eyes. It is not difficult to find polarized sunglasses. The lens itself is made from a blocking material that reflects light. Polarized lenses can be put into any type of sunglass.

A pair of sunglasses can withstand sunshine and make your eyes comfortable, in the meanwhile , a style chic pair of sunglasses have a function of decoration, therefore, recently the sunglasses have generally become one of indispensable goods in summer.  But many people only attach importance to the style of sunglasses, color, appearance and quality, they know a little to the quality  requirement of the intrinsic sunglasses. For reducing or avoiding UV rays impair the eyes, the sunglasses should provide with some functions and demands ,as follows:    1  They should have a filter function to lower the intensity of light, prevent the glare, keep the eyes from too much radiation, ease up the eyes fatigue, increase vision.    2  The component of selective visible light, steming or holding up the harmful component such as UV rays, infrared, and not producing the shift of color, not interfereing with stereo vision.    3   Wearing comfortablely , beautifying the appearance and bearing.

It is always strongly recommended to wear quality sunglasses that offer protection to UV400 level, which will block out 99 – 100% of both UV-A and UV-B radiation and screen out 75 – 90% of visible light. Wrap-around frames can provide additional protection. UV protection is important for us to focus. Short-Term Effects of UV Radiation Like a “sunburn of the eye”, it may be painful and create symptoms including red eyes, a foreign body sensation or gritty feeling in the eyes, extreme sensitivity to light and excessive tearing. A brief exposure to UV radiation, usually when combined with cold wind and snow, is likely to lead to Photokeratitis, which is an inflammation of the cornea. Fortunately, this is usually temporary and rarely causes permanent damage to the eyes. Long-Term Effects of UV Radiation Long-term exposure to UV radiation can be more serious. Exposure to small amounts of UV radiation over a period of many years may increase the chance of developing a cataract, and could cause irreversible damage to the retina. Cumulative damage by repeated exposure may contribute to chronic eye disease, and increase the risk of developing skin cancer around the eyelids.

There are many kinds of sunglasses, they have different function. Today, we will learn some knowledge about polarized sunglasses. We all know, this kind of sunglasses usually use for outdoor sport, for example, fishing. When the sun shines on the water or any other reflective surface, the reflected light becomes polarized. This means that most, although not all of the light waves move in one plane. You see, normal light moves in many planes and polarized lenses allow only light in one plane to pass through the lens. Therefore much of the glare is eliminated. Polarized lenses can not eliminate all reflected light. As we said before, polarized sun glasses eliminate selective parts of the reflected light, thus reducing glare. Although light from the sun is not polarized, it can be separated into two polarized components that are reflected and transmitted in different amounts by the surface of the water. In most cases more of the horizontal component will be reflected than the vertical component, thus partially polarizing the reflected light. In order to help eliminate the glare a lens that is vertically polarized is used. The height of the sun also affects the degree of polarization. The polarized sunglasses worn by fishermen have polarized filters to help block the light reflected by the waters surface allowing them to be able to see under the waters surface.

While people with both presbyopia and myopia problems simultaneously, usually happened on the old people, find it hard to wear ordinary sunglasses for they cannot have a clear vision. So comes to the invention of bifocal sunglasses, which solves the problems of both seeing clearly far and near and preventing harmful UV rays. However, do you know the feature of men bifocal sunglasses? In fact, bifocal sunglasses for men are quite different from those for women as men need to show their vigor and muscularity. At the same time, it must be suitable for many situations, casual or formal. For those men who are enthusiasts for sports, they can go to the professional sports sunglasses store to get the proper bifocal sunglasses. Men spend lots of time outside because men are more passionate with outdoor sports than women. Different sports require different types of bifocal sunglasses, and we may call that advanced. They like rocking, surfing, fishing, golfing and so on, even when they are old and have several eyesight problems. So they need the bifocal sunglasses when at an old age. Besides, men at an old age may need the special bifocal sunglasses to correct their eyesight, like the presbyopia and myopia eye problems. Actually, this kind of sunglasses should focus most on the convenience and clearness of the lenses so as to help old peoples daily life. Compare with young men, it is not the truth when comes to the middle-aged and old men, they prefer to show their maturity. So a classic type with high quality and reputable brand are mostly welcomed. And young men almost no need

Most sunlight damage is done to the eyes before they make it out of their teens so for future benefits, it is best to invest in sunglasses now. However, does it mean that myopia cannot wear sunglasses when they use spectacles to overcome their problems? With the development of technology, this problem has been solved. They can go for prescription sunglasses. Prescription eyeglasses are for those who are out to correct their eyesight, and at the same time look trendy. Nobody can stay indoor when they love sports. When you have eyesight problems, then you need to take more care for your eyes. These prescription sunglasses are a boon to you. Prescription sunglasses are more common with the sport loving person. To play your sport perfectly, you need a clear and disturbance free vision. When you wear prescription glasses you will have clear vision as well as your cornea will escape from the hot sun. So you can enjoy your sport for a long time. When you want to drive out, you need sunglasses. There’s nothing worse, particularly in the winter, when you have that brilliant, un-shaded sunlight from so low in the sky that the car visor would need a 6 inch fringe to be effective. If the road is wet, the sunlight also bounces off that and vision is seriously impaired. With prescription sunglasses, you can overcome both of these problems, thus making you a safer driver. You need prescription glasses to see where your driving but the low sunlight is responsible for many an accident. Prescription sunglasses are each custom made. You need to hand over your prescription to the