According to reports, one of the main functions of sunglasses is to filter out UV rays. As long as the UV-treated sunglasses, the UV index can reach between 96% and 98%, which means that even light-colored sunglasses after UV-treated, it will also achieve the same anti-ultraviolet effect as dark lens sunglasses. Therefore, the UV protection function of sunglasses does not have much to do with its color depth. On the contrary, if you wear dark lens sunglasses for a long time, it will be difficult to see the object in your eyes and it will be easy to fatigue.
In addition, in the state of the darkroom for a long time, the pupil will be enlarged. If the dark lens sunglasses are worn, the quality of the lens is not very good, and the pupil will absorb more ultraviolet rays after being enlarged, so that the damage to the eyes will be greater, and cataracts may be induced, the illness hurts the eyes. To learn how to choose sunglasses that don't hurt your eyes, pay attention to the following points:
1. In the choice of color, it is better to choose yellow lens that filter the blue light better or the gray which has little effect on the color and brightness.
2. It is UV protection, because not all sunglasses can filter UV rays.
3. Should choose brown, gray or green lens sunglasses, and then see if it has UV protection.