Generally, lenses can be divided into1.561.61.671.74 refractive index! This means that the greater the refractive index of the lens, the thinner the lens, the higher the transmittance, the lighter the lens, the greater the hardness, the more wear-resistant, and of course, the more expensive it is, and the price has almost doubled.

Your education proposal 1.67, a little better than 200.

Recommend a good Taobao shop with the name 1005 glasses.