The first small method is to distinguish the quality of sunglasses lenses.
Aim the sunglasses at the light to see if the lenses of the sunglasses are smooth, free of bumps, abrasion and bubbles. Sunglasses lenses that present the above problems often have dizziness and other discomfort, which damages both eyes.
The second small method is to identify whether the sunglasses lens is deformed.
First, carefully compare the two sunglasses lenses of sunglasses to see if the warpage of sunglasses lenses is the same. Then, take the sunglasses 45 cm away from your eyes and investigate the vertical and horizontal lines around you through your glasses. Then, move the glasses up and down, back and forth, such as twisting or swinging in a straight line, to make clear the deformation of sunglasses lenses, and myopia sunglasses lenses can also be selected in this way.
The third small method is to distinguish the quality of sunglasses frames.
First of all, about the metal sunglasses frame, see if there are cracks in the welding point and whether it is firm; You can dig with your nails to see if there will be scratches on the paint surface; For the plate sunglasses frame, carefully investigate whether there are plastic particles, scratches and roughness in its appearance.
The fourth small method is to identify whether sunglasses are 100% UV-proof, that is, UV400.
Do not use instruments to test whether sunglasses have anti-ultraviolet function. First, take 100 yuan, put the sunglasses lens on the anti-counterfeiting watermark, and use the money detector or money detector to shine the anti-counterfeiting watermark on the sunglasses lens. If you can still see the anti-counterfeiting watermark, it means that these sunglasses are not anti-ultraviolet; If you can't see it, it's obvious that these sunglasses can protect against ultraviolet rays.
The fifth small method is to distinguish whether sunglasses are polarizers.
The simplest way, a mobile phone with an LCD screen, inspects the LCD screen through polarized sunglasses lenses and rotates the LCD screen together. The LCD screen you see turns black with the rotation, which is caused by the polarized sunglasses lenses filtering the light in one direction announced on the screen, so congratulations, it is a real polarized sunglasses. Of course, it is more useful to use a large screen LCD.
The sixth small method is to summarize the details to distinguish the quality of sunglasses.
Firstly, whether the two ends of the supporting leaves of the sunglasses frame are symmetrical is investigated; Secondly, pay attention to investigate whether the two temples are flat. You can put the frame flat on the table to see if the contact point is suspended. If one side is high and the other side is low, you need professionals to adjust the sunglasses legs to achieve a balance between the left and right. Third, the temple can be opened and closed, and it feels elastic. It is generally wrong to think that the tighter the better, indicating that the smoothness of the screw is not good, and the temple is simply damaged. It's not good to be too loose. It may be caused by the screws not being tightened. Moderate tightness is the best.
The seventh small way to distinguish between good and bad sunglasses is the tag. The small tag of genuine sunglasses contains quite a lot of information about the quality of sunglasses.
1. The origin of sunglasses and glasses
2. The tag with QS logo is a sign that sunglasses have passed the quality certification.
3. Ultraviolet index information, which is the function of filtering ultraviolet rays. UV400 is the best, but UV380 is a little worse.
4. Raw material information of sunglasses lenses and frames.
The eighth small way is to distinguish the fine print on the sunglasses legs.
First, standardize the sunglasses frames produced by manufacturers, and print the product number, standard and scale, as well as the trademark (English or pinyin).
Secondly, the word "R" is also printed on the framework of trademark registration. If it is second-class or third-class, the words "2" or "3" are printed on the frame to expose and inform consumers that it is not genuine, and to safeguard the commitment of manufacturers and commodities.