What is different between plastic and glass lenses?

[prescription eyeglasses]

Sunglasses lenses are made from different materials, plastic, glass and polycarbonate. Plastic is going to be light, but can be safer than glass products. Glass is more durable and more resistant to scratching, not only heavy, but also very dangerous. If you want to find a happy medium, the pick the polycarbonate lenses. Then there is the tint, and protection from the dazzling sun light.

Today，most optical factory produce plastic lenses, due to plastic is too lighter, but glass are too heavy to wear with the much too stress.