How to identify the good and bad of the quality of the sunglasses

1. look at the appearance of the glasses
1) plating, paint coating, the plate surface polishing and other surface color uniform, no obvious flaws, spots and scratches.
2) lenses, temples and other printing,
Laser and engraving strokes clear and smooth, easy to read, easy to fall off.
3) the correct lens color, no color scratches and bubbles, progressive films over the natural color, the left and right lens color symmetry.
4) feet of the glasses in his hand is facing the fluorescent, reflective mirror gently move the fluorescent film does not appear wavy, distorted shape, indicating that there is no stress in the lens.
2.look at the packaging and Origin Description
Good glasses complete package, tag or manual, tag, Product Code and instructions on the product description, content quality standards of the industry and the dealer or contact the manufacturer.
3.and finally try them
Good glasses to see clearly true, wear comfortable, there is no feeling of oppression nose, temples, ears. Fine workmanship, feel smooth and delicate, smooth and natural.
Different groups of people, according to different preferences and different uses to select the sunglasses, but the most fundamental from which you want to protect the safety and vision of the wearer not to damage the basic principle. Reducing light stimulation, visual clarity without distortion, anti-UV, no distortion of color recognition, accurate identification of the traffic signal should be a basic function of sunglasses. The function defects, ranging from loss of sunglasses role of weight will produce dizziness, eye soreness consciously adapted to the symptoms, sometimes unresponsive, debate color illusion inequality symptoms and walking depending on the material and lead to accidents . Choose sunglasses can not just focus on style to the neglect of its intrinsic quality.
Gray piece: gray lenses can be balanced on any chromatographic absorption, so watch the scene will darken, but there will be no obvious color difference, show the real natural feeling. A neutral color.
Tinted lenses: filter out a large number of blue, you can improve the visual contrast and clarity, serious air pollution or foggy case wearing better. Generally can block the smooth and shining surface reflected light, wearing glasses can still see the subtle part is ideal for the driver.