What harm might cheap sunglasses have?

　　Sunglasses are really a very useful item, not only the darling of the fashion industry, but also our must-have things in summer. There are also many styles and colors of sunglasses. Many people also like sunglasses, but we You will also find that the price difference of sunglasses is still very large, there are dozens of dollars, and there are hundreds of dollars, so what is the difference between these sunglasses? Let us take a look.

　　What is the harm of cheap and inferior sunglasses?

　　1. Whether it is sunglasses for tens of dollars or sunglasses for hundreds of dollars, they have the function of dimming the outside light, but dimming the light does not mean blocking ultraviolet rays. Some sunglasses can also reduce the degree of glare, but they cannot Block ultraviolet rays. Generally, the more expensive sunglasses can guarantee its function and quality, but the cheaper sunglasses cannot.

　　2. Wearing inferior sunglasses will cause damage to the eyes. Wear sunglasses, the light becomes darker, so people’s pupils will increase, but because inferior sunglasses can’t block ultraviolet rays, it is equivalent to a large amount of ultraviolet rays ingesting enlarged pupils, which is very harmful to the eyes, and ultraviolet rays are harmful to the eyes. The damage is cumulative and irreversible.

　　3. Inferior sunglasses harm eyesight. General glasses, whether it is sunglasses or other glasses, have a reasonable design of optical indicators, including sphericity, prism, etc. If the design is unreasonable, it is easy to deform the vision, causing double fatigue of the eyes, and vision loss in the long term. Good sunglasses are functionally capable of preventing ultraviolet rays; optically, they reduce visual distortion and protect eyesight; they are comfortable and strong to wear, but relatively inexpensive sunglasses cannot guarantee their functions and are easy to damage the eyes.