Metal frames:
Metal frames comprise gold, rhodium, palladium, silver, nickel, chrome, ruthenium, titanic, aluminum, copper, stainless steel and so on. An advantage of metal frames is that they own flexible nose support, which can ease the burden of your nose bridge, which is especially good for teens. Gold, a metal with perfect ductility, hardly has any circumstance of oxidation or color changing. Whereas, gold frames are too heavy and too expensive to ordinary people to bear. If you want to buy a frame at medium price, you can try titanic or nickel alloy material. It is light, containing high levels of antioxidant, meaning that your skin will never get allergic. Copper frames are cheap. However, they are easy to rust, thus damaging your skin.
Non-metal frames:
The most luxurious material for frames is tortoise. Similar to gold, it is very expensive and rare material. Plastic, the most common non-metal material for eyeglass frames, is appreciated by many people. However, there exist hundreds of kinds of plastic, making their price differences very big. To choose a good pair of plastic frame, you should test its flexibility, smoothness and symmetry. Cellulose acetate resin is also a very hot material in recent years. It’s easy to be colored, polished and processed. When exposed to strong light, they are unlikely to shade color or lose flexibility. Thus, they are very easy to preserve.
Recently, buying glasses online has become very popular. To get a good pair of eyeglasses, you had better go to big and regular shopping sites such as Firmoo, and make comparison between different styles. The question what kind of frame is good depends largely on your values and preference.
Article From：
http://www.theeyecareblog.com/what-kind-of-frame-is-good.html
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