Tag This little brand often neglected.In fact, in addition to telling you the tag glasses origin, but also hides a lot of useful information, such as whether you buy glasses or sunglasses, light microscopy, the resin lenses or other types of lenses.Lens.Lens is the soul of a pair of glasses, which have a direct impact on the quality of glasses.Identify the quality of the lens there is a simple way is to take the glasses in front of swaying back and forth to see if the object lens with the move.If so, the lens is not flat, there are convex, are substandard lenses.Of course, this is a plain mirror is, if it is short-sighted sunglasses this trick may not quite sure of.The material is now produced mainly colored glasses and polarized PC other four.The biggest advantage PC lens material is toughness, thermal expansion coefficient is small; polarized lenses filter out unwanted light due to make objects look very clear, because the reflective surface can resist, especially when worn for fishing, but these lenses also not perfect, for many drivers, too clear effect, but impede the line of sight while driving.So when choosing a lens material, but also ask more understanding.Color in addition to leisure, entertainment, if it is anti-UV, it is best to buy genuine brand sunglasses lens shading effect, because these relatively soft colors, nature does not change color when looking for car owners, especially Good, because it would not affect their resolution on the traffic lights and other traffic signals.UV index.Pair of sunglasses is, UV index is UV filter effect, is a very important criterion, the vast majority sunglasses, UV index in the range of 96 % -98 %, dark lens is better than light-colored lenses.

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