In summer, a pair of sunglasses is a necessity for people to protect eyes from UV rays and glare. But nowadays, there are kinds of materials can be used to produce sunglasses lenses such as plastic sunglasses, which make people hard to choose different sunglasses lenses. This passage is mainly about the several kinds of materials of sunglasses lenses.
Referring to sunglasses lenses materials, there are mainly five kinds of materials prevailing in the present sunglasses market.
Glass lenses: Glass lenses are the traditional ones, having been used for some time. Glass’s optical clarity is the best and such glass lenses have little amount of distortion .However, glass lenses are fragile and relatively heavy. Being fragile decides that glasses lenses can’t be recommended for active sports eyewear due to the risk of injuries to the eyes. And its weight also means that glass lenses can’t acquire many people’s affection.
Plastic Lenses: Compared with glass lenses, the first advantage of plastic lenses is that they are much lighter and therefore they are less likely to cause indentations. The second advantage is that plastic lenses are more resistant to impact. In addition to the former advantages, another advantage is that plastic lenses can be tinted very easily. However, plastic lenses do need a scratch-resistant coating.
Polycarbonate Lenses: Compared with plastic and glass sunglasses lenses, polycarbonate lenses are thinner and lighter. They also offer 100 percent protection from the sun's harmful UV rays and are up to 10 times more impact-resistant than glass or plastic sunglasses lenses. Because of their safety, polycarbonate lenses have become the standard for safety glasses, sports goggles and children's eyewear. Despite the safety, polycarbonate lenses have a big deficiency that they can’t be tinted. This means that a person who choose polycarbonate sunglasses lenses must sacrifice fashion to safety.
Trivex lenses: Trivex lenses have all the advantages that polycarbonate lenses have. In addition to those advantages such as safety, trivex lenses can be tinted. For those people who want be safe and fashionable at the same time, purchasing trivex sunglasses lenses is an excellent choice.
High Index Lenses: High-index lenses are alternative choices to standard plastic lenses.They are thinner and lighter than plastic lenses. And the most important advantage is that they are pretty good for prescription sunglasses. However, the problems of High-index lenses are that they are not durable and also need Anti-reflective coating.