I want to buy a pair of non-prescription sunglasses recently, But I don't know which kind of frame should I choose, plastic one or metal one? Anyone can give me a piece of advice?

Gnerally speaking,plastic frames are more durable than metal frames,and looks more beautiful,but for sunglasses ,plastic frames are also common used material,and plastic frames are more lightweight,so I think you can think about plastic frames.Thanks.

Lens materials of prescription sunglasses differ quite a lot. Some are heavier than others and some types are more durable as well. Here are three materials that have been commonly used for prescription sunglass lenses:

?Polycarbonate, it is a durable lightweight plastic lens.

?CR-39, great plastic lens used mostly in prescription-grade lenses.

?Glass, which is much more durable but much heavier to wear.