We are an eyewear manufacturer from Wenzhou China, also we invested in a sunglasses lenses production line. Kindly please have a review with the below promotional video if you are interested. Here now we have to know how to help our customers choose the matched lenses. Most of the factories do not know them clearly, so now the following is my brief introduction to the different kinds lens one by one. 

AC lens: Basical calling with acrylic lens, extremely high perspective, lowest cost, brittle material, may have brittle chips when broken, and average stability of optical indicators. Usually used in the cheapest reading glasses lenses or transparent fixed-shaped lenses of optical frames.

PC lens: Injected molding process. When the thickness reaches a certain level, it is bulletproof glass, which is strong and impact-resistant, not easy to break, and not expensive; because PC and Acetate are incompatible, PC lens can only be used in injection molding frames, usually used in sports sunglasses and labor protection glasses. 

TAC lens: It is a polarizing technology. Unlike the injection molding process of other lenses, it is made by lamination, and the polarizing layer is sandwiched like a sandwich. The price is relatively low, and it is the most cost-effective polarizing function lens among all polarized lenses, but the disadvantage is that the thickness is thin, the light transmittance is poor, and stratification will occur after a long time or soaking in water.Usually used in some economical or small brand sunglasses 

CR39 lens: Casting process. Lightweight,easy to dye, rich colors, and strong optical properties. It is the preferred choice of some mid-to-high-end sunglasses brands. 

Nylon lens: Injected molding process. Made of nylon, it has high elasticity and strong impact resistance. It is relatively expensive and is a safety lens. The manufacturing process is relatively environmentally friendly. It is the preferred choice of some mid-to-high-end sunglasses brands.

Glass Lens: High clarity, but heavy and easy to break, high price, few people use it recently. Now it is mostly used in Ray Ban styles.

Meanwhile, there are also have PC polarized and Nylon polarized lens for the high end sunglasses collection.

We do hope this guides help you have a better understanding of the glasses lens.For more details, please contact us!