Lenses are available in a wide variety of materials. Even though glass used to be the material of choice because of the optics quality it provides, many people are eschewing it now because of its weight and its propensity to break when hit. Today, prescription lenses are usually made from polycarbonate, high-index, and CR-39 (regular plastic). There is even something called a photochromic lens. This kind of lens is dark in bright sunlight, but turns lighter and more translucent when sunlight is reduced - for instance, when the wearer goes indoors.Fake Oakleys It may be very convenient because the user doesn't have to remove his or her corrective sunglasses to put on regular glasses. But remember that some photochromic lenses are not designed for ultraviolet (UV) ray protection. And one of the prerequisites of good quality sunglasses, corrective or otherwise, is that they should be at least 90 percent effective in blocking UVA and UVB rays.People with more complicated vision problems than astigmatism or myopia - such as presbyopia - can also benefit from the wide variety of prescription sunglasses out there today. Those with presbyopic vision oftentimes need bifocals or progressive lenses, which are available in sunglass version. Bifocal sunglasses that are ready to wear (if you already know your prescription) are available from brands such as Action Tropics. Another innovation in optical wear that are of great benefit to those with vision problems has to do with polarized lenses. This type of lens can be used for corrective sunglasses. The main benefit of polarized sunglasses is that they block the glare that results from sunlight bouncing on surfaces like water, pavement, and snow. They filter the light waves that cause the glare, but allow other types of light wave in, so the wearer gets to enjoy sights under a bright sun naturally, but without having to strain the eyes by squinting against sunlight.Before going out to purchase a pair of prescription sunglasses, it would be best to visit an eye expert to determine the grade of glasses you need. If you wear contact lenses,Fake Oakley Frogskins remember that your contact lens grade may be different from your spectacles grade. Remember also that certain types of frames may not be suitable for you - either because they are not suited to your face, or because the lenses you need are too thick to fit into the frame you want. In any case, an optician or another eye professional can give you advice and help you choose the right pair of prescription sunglasses for you. Baseball, the greatest pastime of America. It's such a part of many Americans' lives: little children pitch and bat in the Little League while their parents proudly look on. The same intensity can be felt by baseball players in the Big Leagues. They feel pressure not only from public scrutiny, but also from making sure that they take every step possible to avoid injury or sickness, because time away from the field means less money and more chances of being replaced by someone younger and stronger. Baseball sunglasses are part of a player's arsenal of protective bodywear and accessories for staying in the game. Many baseball games are played at night, but about just as many are played outdoors in broad daylight, too. This is when baseball sunglasses are indispensable. Without such sports sunglasses, trying to catch a ball - especially one that is hit up high - is very difficult indeed. Staring straight up into the sun while trying to ascertain the ball's location and speed of descent can strain the eyes and increase the chance that the ball will be missed. It is partly for this reason that baseball players wear sunglasses - to enhance theirFake Oakley Fuel Cell playing performance. Many baseball sunglasses come with lenses that are optimized to eliminate glare and enhance vision, especially on sunny days. Baseball players prefer wearing so-called amber sunglasses on such days, even though the lenses aren't really amber. More often than not, they are either brown or gray.There are also baseball sunglasses that are suitable for games played at night, but the tint of the lenses need to be considered very carefully. It is best to use clear lenses that have an anti-reflective coating to offset or absorb the glare of bright stadium lights. Baseball players sometimes use sunglasses with yellow lenses for indoor games, but experts warn that such colored lenses can compromise visual discernment and can affect reaction times.liuliping/blog201205

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