What does the material of Birch eyeglasses look like

The material of Berkey eyeglasses varies according to different styles, and there are three kinds of lens materials for Berkey eyeglasses.

1, resin lenses: resin lenses are a lighter material with good impact resistance and better UV protection.

2, high hardness lenses: high hardness lenses are a relatively hard material, better scratch resistance, but relatively fragile.

3, glass lenses: glass lenses are a traditional lens material, good light transmission, good scratch resistance, but relatively heavy, poor impact resistance, fragile.