Today, most optical retailers no longer use glass to make eyeglasses. Although some people still like glass lenses over anything else, most eyeglass wearers have turned to more advanced optical technology. There are two main lens materials that are used more than any other these days. They are made of Polycarbonate and CR39. Aside from being made up of different elements, they also have some differences in terms of feel, look, durability, and price.

CR39 is a type of plastic. Most discount eyeglass manufacturers offer their cheapest pairs with CR39 lenses. This is because CR39 is extremely cheap. The manufacturing process is easy and very affordable for optical companies. Believe it or not, CR39 is actually better optically than polycarbonate. The difference is incredibly subtle, but it’s there. However, many people choose other lens materials anyway due to the disadvantages of CR39. Because it is a type of plastic, CR39 is not very durable. If the lenses are stressed or bent in some way, or if the glasses are accidentally twisted, the chances of the lenses breaking or chipping are not terrible. CR39 also tends to be a bit heavier and thicker than a polycarbonate lens of the same prescription. If you’re looking to buy prescription sunglasses, CR39 might be a good idea. Tends to tint and hold tint better than other lens materials. In fact, most non-prescription sunglasses are made with some type of plastic lens.

Polycarbonate is comparable to an acrylic material and has many uses. In fact, it has been used to make bomb-proof shelters. Polycarbonate is incredibly durable. It can practically be folded in half without breaking. That is why it is law that children’s glasses are made only with polycarbonate. Compared to other lens materials, it is also thinner and lighter. For the most part, wearing a pair of glasses with polycarbonate lenses doesn’t weigh your face down and head down, or give you headaches. Another great quality that it has is the resistance to scratches. No matter what lens material you have, scratches are always possible. However, polycarbonate is known to be very resistant to permanent scratching.

When thinking about which lens materials to buy, keep these facts in mind. Weigh the pros and cons of everything you find and make an informed decision. Glasses are all about preference, and you need to be as detailed as possible when buying them.