1, the main component of the crystal is silica crystal, which has been used as a glass material for a long time. Because of its good transparency and high definition, many people think crystal glasses are good. Because it was impossible to design optical glasses before, crystal glasses have a high status.

2. Many people also want to know whether it can protect their eyes. In case of sandstorm, it won't produce sand, and it has a cool feeling, so many people think it has a good eye protection function. In the northwest, it is also considered that it can treat patients with "fire eye" and "red eye", and it is even called "treasure mirror". In fact, the hardness of crystal is relatively high, but the purity is too poor, and it contains a lot of radioactive element radon, which is harmful to eyes and human health.

3. Moreover, crystal glasses can't directly absorb ultraviolet rays and infrared rays, but they will still directly shoot into the glasses, causing certain harm to the eyes. Wearing crystal glasses in the sun for a long time, glasses will feel very tired, easy to cause cataracts, and its heat conduction is relatively high, it is easy to appear sultry phenomenon.

From this point of view, there is no saying that crystal glasses can protect eyes. Listen carefully when you buy it. There are still some unscrupulous merchants cheating consumers, so you should keep your eyes open when choosing glasses. At present, optical glasses are the trend of future glasses.