How to identify common sunglasses and polarized sunglasses?

1. Looking for a liquid crystal display, the easiest way is to look for mobile phone, glasses level to the phone's screen, glasses in front of the screen turns, screen becomes gradually, this is the polarized lens, if there is no change, no matter how isn't polaroid. ( This method of CCTV finance has been reported, you can try it) Recommended reading: 【 Sunglasses sunglasses factory small common sense 】 Wearing sunglasses N reason 2. This is the most simple way: will the two polarizing lenses stacked vertically, for the sun glasses will appear opaque phenomenon, if the pervious to light, that at least one deputy not polarized lens. Reason is the polarizer lens special design of parallel light through the lens, when the two lenses stacked vertically, most of the light is blocked. So when buy, as long as such a simple operation, can immediately know the authenticity of a product and the good or bad. 3. Store had generally have special identification plate to detect polarizer, wear a polariscope didn't see the pattern to the naked eye can see you! Wear the ordinary sunglasses also can't see that pattern. The following identification plate, for example, when you wear polarized sunglasses, can clearly see a big fish, no wear or wear ordinary sunglasses can't see. 4. UV400 mean 100% keep out ultraviolet ray. The following method can be simple and easy measure the anti-uv effect of lens. The sunglasses on the market may not have isolated the effect of ultraviolet ray, if you want to know whether the lenses can isolate uv: looking for a uv yanchao lights, or yanchao pen, a piece of one hundred yuan. Direct illuminate can see above one hundred yuan RMB uv anti-counterfeiting. If through the lens with UV400 functions, see the anti-counterfeiting.
related: the sun glasses