First of all, we need to understand the difference between sunglasses and cheap oakleys Polarized Sunglasses:General Sun glasses just using reduction light of role, because General of lenses cannot filter light, so only reduce glare light (glare light of harmful sexual is enhanced brightness, weakened color saturated degrees, make objects outline became blurred, make eyes fatigue, and does not apply.), and purple outside light, of strength, and cannot full barrier these harmful light, so its features just reduced eyes of hurt, but General Sun glasses maximum of advantage is epidemic better. Polarized Sunglass lenses are a polarizing nature, can be completely blocked due to scattering, inflection, reflection caused by various factors such as the dazzling glare. As well as UV light can be harmful to the human eye full barrier, Korean contact lenses makes people in long-term activities under strong light, eyes are not easily tired, real protection function, and we can see things more clearly, stereo. Therefore, Polarized Sunglasses are ideal for wear when driving and outdoor activities.Oakley Polarized Sunglasses identification methods:Of degrees 1, lenses should meet the requirements for flat lenses, and should not affect the optical defects of vision. Simple method for identification of Oakley Polarized Sunglasses can be placed in front of, through observation targets in the distance of the lens, such as window frame or door frame, then the glasses up and down back and forth, swing and the goal should not have wavy deformation. Oakley Polarized Sunglasses under a fluorescent lamp image of the surface of the lens and moves the sunglasses that lamp image will appear in different parts of the lens, lamp images without distortion is the best. Polarization of Polarized Sunglasses on the market today, mostly using a thickness of 0.7mm resin polarized lenses, because the lens is thin, is prone to deformation in Assembly, purchase should pay special attention.2, lens color is not partial, should the ambient color to insure. Without first wearing Polarized Sunglasses, observe objects in colors such as red, green, yellow, and wear Polarized Sunglasses, observing the same object twice and observation of color is not the color, otherwise it will reduce the ability to recognize traffic lights. Color sunglasses eyeglasses for the identification of particular attention should be paid to this.3, when the eyeglasses store Oakley Polarized Sunglasses, there will be a small card to test Polarized Sunglasses, also you can test through the test card. For online friends, there may be a problem is not that Polarized Sunglasses test card how to identify buy back is polarized Sun glasses? The first method: color blindness treatment contact lenses looking for friends around have polarized sunglasses, a pair of authentic, and then place the 2 oakley sunglasses cheap Polarized Sunglasses, crossed, if the intersection doesn’t see objects behind it are polarized sunglasses. Second: according to the principle of LCD displays, observation cell phone LCD screens, such as through polarized lenses, rotating screen when will also be rotated on the screen changes to a black screen, because single polarizer filter screen caused by the direction of light.