Glass lenses, with more than other materials, more scratch-resistant properties of the lens, but the relative weight of its sink, the refractive index is relatively high: ordinary film is 1.523, ultra-thin film: 1.72 or more, up to 2.0.

The main raw material of glass lenses is optical glass. Its refractive index is higher than the resin lens, so the same degree in the case, the glass lens thinner than the resin lens. Glass lens light transmittance and mechanical and chemical properties are better, a constant refractive index, physical and chemical properties and stability. No color of the lens called optical white care (white), colored film in the pink film called Crocker lenses (red film). Crocker lenses can absorb ultraviolet light, a little light on the absorption of light.

Glass optical properties of superior, not easy to draw flowers, high refractive index. The higher the refractive index, the thinner the lens. But the glass is fragile and the material is heavy.