How can lenses be made out of plastic or resin?
Resin is plastic, plastic is resin, different name only, the general production of industrial raw materials called resin, made out of finished products called plastic, such as plastic basins, plastic cups and the like. Probably because most of the plastic products are cheaper, make lenses, or continue to call the resin, not plastic, so as not to feel too worthless.
Of course, the resin can be divided into many types, you can do is not transparent lenses, transparency, refractive index and wear resistance have higher requirements, like ordinary glass can do glasses, optical glass must be dedicated to. Although glasses are profiteering products, but the quality of high-grade lenses will be much cheaper than the quality
