Sunglasses is really a very useful item, not only the darling of the fashion industry, but also a must-have thing in the summer, and there are many styles and colors of sunglasses. Many people also like sunglasses, but we It will also be found that the price difference of sunglasses is still very large, there are dozens of pieces, there are hundreds of pieces, then what is the difference between these sunglasses? Let us take a look at it.
First, what harm is the cheap and inferior sunglasses?
1. Whether it is tens of dollars of sunglasses or hundreds of dollars of sunglasses, it has the function of dimming the outside light, but the darkening of the light does not mean blocking the ultraviolet rays. Some sunglasses can also reduce the degree of glare, but not Block UV rays. The more expensive sunglasses can guarantee the function and quality, but the cheaper sunglasses are not guaranteed.
2, wearing inferior sunglasses will cause damage to the eyes. With sunglasses, the light is dimmed, so the pupils of the person will increase, but because the inferior sunglasses can not block the ultraviolet rays, it is equal to a large amount of ultraviolet rays to take in the large pupils, which is very harmful to the eyes, and the ultraviolet rays are on the eyes. Damage is cumulative and irreversible.
3, poor quality sunglasses hurt vision. General glasses, whether it is sunglasses or other glasses, have a reasonable optical index design, including sphericality, prismatic degree, etc. If the design is unreasonable, it is easy to visually deform the object, causing the eyes to double fatigue, and the vision will decrease in the long run. Good sunglasses are completely UV-resistant in function; optically reduce visual distortion and protect eyesight; comfortable and strong in wearing, but cheaper sunglasses do not guarantee their function, which is very easy to hurt the eyes.