Dozens of pieces of sunglasses and what is the difference between hundreds of pieces of sunglasses?

Sunglasses this thing really is a good thing, even if the plain people, the sunglasses temperament immediately after the ascension, what do you think is cool! Too many styles and brand sunglasses, however, have a few money, also have a few hundred dollars. Recommended reading: chongqing where cheap glasses someone may ask, inferior sunglasses is cheap, but better than not Dai Qiang? Wrong! If is the sunglasses quality is unqualified, it is better not to wear. For two reasons: 1, permanent injury eye wear sunglasses, the light dimmed, so the person's pupil is increased, but because you can't block uv rays, the sunglasses and the intake is equal to a large number of ultraviolet dilated pupils, this injury than don't wear eyes! And uv is accumulated and irreversible damage to the eyes. Dozens of pieces of sunglasses and what is the difference between hundreds of pieces of sunglasses? 2, damage eyesight, the mainly work problem. Glasses, sunglasses and other glasses, there is a reasonable index of optical design, including the steradian, prism, etc. , if the design is not reasonable, easy to see things deformation, cause eye fatigue, double vision will decline in the long term. Good sunglasses, on the function can prevent ultraviolet ray; Reduce the vision on the optical deformation, protect eyesight; On the wear comfortable, sturdy, and tall, the design and brand strength, so there are a large number of people willing to pay high price! 吗? 吗?