Lens materials of prescription eyeglasses

Nowadays, we buy glasses according to their frame material, lens material as well as their brands and styles, as there is huge variety of glasses in the market, and when in some local stores, we may often hear the retail staff refer plastic eyeglasses and metal eyeglasses, actually, In most cases, they mean the material of the eye wears which they are introducing to you, such as“plastic eyeglasses” refers to eyeglasses that have plastic frame material. And today's people are more inclined to compare these twokinds of frames, though these two frame materials do have some differentfeatures, they both have their respective pros and cons, such as metalones are more durable and the temples can be made much thinner thanplastic one, but some people's skin may be sensitive to such material, while plastic ones solve this problem perfectly and they are muchlighter, the drawback is their poorer durability.

Actually, plastic eyeglasses can also be used to describe eyeglassesmade of plastic lenses. Before the 20th century, which is a time people all needed to wear heavy and low refractive index glass lenses, and youmay heard that a pair of these lenses can exert considerable weight onthe wearer's nose, especially for those who have a strong prescription,there were no high index lenses as today, so, the lenses are becomingexaggerated heavy and thick, that's the reason why we call them“coke-bottle” lenses, so, plastic eyeglasses lenses were a greatinvention. And what's more, those glass lenses are quite fragile, in a serious case, the eyes may get injured when the lenses are hit by a punch, so, how many pairs of eyeglasses do a basket player who suffersfrom myopia need to buy in one year? So, we can get this conclusion, itwas these disadvantages of eyeglasses lenses that forced innovators todevelop an alternative.

In general, plastic lenses are much lighter, safer, and more durable than old-day glasses lenses, that's to say, plastic lenses perfectly solve the problem of being lightweight and shatter-resistant. Wearerscan enjoy comfort and safety from these plastic eyeglasses, and it isestimated that approximately 73% of the world's eyeglasses lenses aremade of plastic. After a couple of decades' progression, more complexplastic lenses are innovated, which have more additional advantagescompared with traditional plastic, a typical example is CR-39 lenses,which have been the standard material for eyeglasses lenses for manyyears. They are not only light but also have better UV light protection,and are less likely to shatter, and they can still be treated withadvanced coatings such as scratch-resistant coating!