How does the material of sunglasses affect its UV protection effect?

Glass lenses: Ordinary glass itself has a certain UV absorption capacity, but the effect is limited. Some high-quality glass lenses will add special metal oxides or other UV absorbers, which can effectively block UV rays. For example, glass lenses with ingredients such as cerium oxide can absorb most UV rays and provide better UV protection. Moreover, the chemical properties of the glass lens are stable, not easy to age, and the anti-ultraviolet performance is relatively stable after long-term use.

Resin lenses: The resin material itself has a weak ability to block ultraviolet rays. However, by adding UV absorbers to the production process of the resin lens, its UV protection can be significantly improved. These absorbers are able to convert UV light into heat or other harmless forms of energy, thereby preventing UV light from passing through the lens. In addition, the resin lens can also form a layer of anti-ultraviolet film on the surface through coating technology to further enhance the anti-ultraviolet effect. But resin lenses are susceptible to chemicals and high temperatures, which can lead to decreased UV protection.
PC lens (polycarbonate lens) : PC material has a natural anti-ultraviolet performance, it can absorb most of the ultraviolet light, especially for short wavelength UVC and some UVB has a good blocking effect. This is because certain chemical bonds in the PC molecular structure are able to absorb the energy of ultraviolet light, thus preventing it from passing through the lens. At the same time, PC lenses can also be further improved by adding additional UV absorbers and surface coating treatment. PC lens strong impact resistance, suitable for a variety of outdoor activities, can protect the eyes from UV damage at the same time, provide good safety protection.
Polarized lenses: The main function of polarized lenses is to filter polarized light and reduce glare, but it usually also has good UV protection. Polarized lenses are generally added to the production process of ultraviolet absorbers to ensure that they can prevent UV damage to the eyes while effectively blocking polarized light. Polarized lenses, whether made of organic or inorganic materials, can be properly treated to achieve high UV protection standards, providing comprehensive protection for the eyes.