But Consumer Reports' expert steps will help. The two best-selling eyeglass lenses are the most basic ones: CR-39 and the polycarbonate, both plastic. (Few people now use glass, which is heavy and ...

The types of lenses you choose can make a big difference in the quality of your eyeglasses. Depending on what your eye doctor advises, some people can get along just fine with basic plastic CR-39 ...

It is sometimes referred to as standard plastic. CR-39 lenses are inexpensive, and they are not as light or durable as pricier options. People with stronger prescriptions—which require thicker ...