How to distinguish the quality of sunglasses?
1. How to distinguish the quality of sunglasses lenses?
The quality of sunglasses lenses directly determines the viewing effect of people. Only lenses with good quality and material will be comfortable to use, and the glasses will not be hurt.
Some fake sunglasses, if worn for a long time, the glasses will be painful and uncomfortable, and some even cause vision damage.
Therefore, when we identify the quality of the lens, we can align the sunglasses with the light and check whether the surface of the sunglasses lens is smooth, without bumps, scratches and air bubbles.
Most of the lenses with the above problems will cause discomfort such as dizziness and damage the eyes, so avoid the selection of these lenses when purchasing.
2. How to identify whether the sunglasses lens is deformed?
In addition to paying attention to the material and workmanship of sunglasses lenses when purchasing, you must also pay attention to whether the lenses are deformed. Deformed sunglasses will affect the viewing effect, and will also greatly damage the vision.
Of course, to determine whether the lenses are deformed, we can carefully compare the two lenses of the sunglasses to see if the warp of the lenses is the same. Then, take the sunglasses 45 cm away from the eyes, and observe the surrounding vertical and horizontal lines through the glasses. Then move the glasses up and down, back and forth, such as straight line distortion or swing, indicating that the sunglasses lenses are deformed, and myopia lenses can also be selected by this method.
3. How to distinguish the quality of sunglasses frames?
In addition to the importance of lenses in sunglasses, the quality of the frame is also an important factor affecting the quality of sunglasses. Usually a good frame is comfortable and relaxing to wear, will not affect the skin, and will not loosen or slip sideways when worn for a long time.
The opposite is true for inferior frames. Frame selection is also critical when choosing sunglasses.
First of all, with regard to metal sunglasses frames, we should pay attention to whether the welding points are cracked and whether they are strong; you can use your fingernails to pick them up to see if there are scratches on the lacquer surface; for the sunglass frames made of sheet metal, carefully observe its surface. Whether there are plastic particles, whether there are scratches, whether it is rough. Whether the frame is distorted, etc.
Paying attention to these details is helpful to choose a good sunglasses.
4. How to tell whether sunglasses are UV-resistant?
As we all know, the biggest feature of sunglasses is UV protection. And a high-performance sunglasses UV protection rate of more than 99%.
Good UV protection is a crucial factor in our decision to buy sunglasses. Therefore, it is necessary to detect the UV protection rate of sunglasses.
Usually 100% UV protection is UV400. To test whether the sunglasses have anti-ultraviolet function without an instrument, first take a piece of RMB 100 yuan, put the sunglasses lens on the anti-counterfeiting watermark, and irradiate the lens against the anti-counterfeiting watermark with a money detector or a money detector. If you see the anti-counterfeiting watermark, it means that the sunglasses are not UV-resistant; if you can't see it, it means that the sunglasses are UV-resistant.
5. How to identify whether the sunglasses are polarized sunglasses?
Buying polarized sunglasses is a hobby of many friends, because polarized sunglasses can effectively exclude and filter the scattered light in the beam.
The light can be put into the visual image of the eye on the light transmission axis of the right track, so that the vision is clear and natural. Just like the principle of blinds, the light is adjusted into the same direction light and enters the room, which naturally makes the scenery look soft! And it can filter out 99% of dazzling and random reflected light and 96% of harmful ultraviolet rays.
When people are active for a long time under strong light, the eyes are not easy to get tired, and the real protection function is achieved, and the things that can be seen are clearer and three-dimensional.
Therefore, it is also more suitable as the first choice for driving, fishing, cycling, hiking, mountain climbing and other activities.
The easiest way to identify a mobile phone with an LCD screen is to observe the LCD screen through polarized sunglasses, and rotate the LCD screen at the same time. The direction of the light caused, then congratulations, are true polarized sunglasses.
Of course, it is more effective to use a large-screen LCD monitor.
6. How to identify the details of sunglasses?
In addition to the important position of sunglasses, attention should also be paid to the details. You can observe whether the two sides of the stipules of the sunglasses frame are symmetrical; observe whether the two temples are flat, and you can place the frame flat on the table to see if the contact point is suspended. If one side is high and the other is low, you must ask a professional Adjust the temples; also open and close the temples, feel the elasticity.
Usually everyone thinks that the tighter the better is actually wrong. It only tells you that the lubrication of the screw is not enough, which will easily cause damage to the temple. Of course, it is not good if it is too loose. It may be that the screw is not tightened and the tightness is moderate. .
7. How to distinguish whether the sunglasses are good or bad, you can see the tag
Generally, regular sunglasses have a small tag, which contains a lot of information about the quality of sunglasses, such as: the origin of the sunglasses; whether the sunglasses have the QS logo, that is, the logo that has passed the quality certification; the UV index of the sunglasses is the filter Ultraviolet effect, the general UV400 is the best, and the UV380 is slightly worse; information on the materials of the sunglasses lenses and frames, etc.
