Online shopping is becoming mature and many glasses wearers choose to buy glasses online as the price is cheaper than glasses which are sold at real shops. A pair of glasses is composed of a frame and two lenses. Therefore, when you are selecting glasses, you have to decide to buy the kind of frame as well as lens. However, a lot of customers only have a little knowledge about it. Well, after you finish the following content, you’ll get quite clear about what kind of glasses is the best one for yourself.

First, let’s talk about the frame. Early mainly materials of frame are metal and hawksbill. There are frames which are made of plastic and alloy etc in these days. In recent years, the production of frame has many breakthroughs both in technology and application. Material of frame which is on using memory alloy, the glasses, can maintain its shape, won’t break even buckling it, it makes glasses have longer life and avoid inconvenience caused by frames broken as well. Join spring glasses in the frame of the arm will make glasses more durable. And frame made of titanium is light and corrosion resistance. It can avoid losing luster in long time wear because of sweat corrosion of metal. After have considered all the advantageous and disadvantageous of all kinds of frames above, then you’ll make a correct decision.

Generally speaking, there are three common materials of lens, glass, polymer resin and PC. Each of them has its own characteristic. Glass lenses are used more common and more scratch resisting than other materials, but on the other hand, the weight of glasses lenses is heavy relatively. Polymer resin lens is lighter than glass lenses and impact resistance, but because of its low hardness, it is easier has scratches than glass lens. PC lens is more impact resistance than polymer materials. It is often used in transparent window of aviation, the police mask, the mask of on the astronauts’ helmet. It is only about one-tenth of the weight of the glass lens and is only half of the weight compared with the traditional resin lens.

After reading the articles above, now, I believe you should have certain knowledge about frame and lens. As most of us need dozens of pairs of glasses in our lives, if you choose to buy glasses online, you can save a lot of money. In a word, buy glasses online is much convenience and swift.