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Are glass lenses UV resistant?
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Are glass lenses UV resistant?

  • Time of issue:2022-04-22
  • Views:0

Are glass lenses UV resistant?

  • Categories:璀璨发布
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  • Time of issue:2022-04-22
  • Views:0

Yesterday a customer asked if the lenses are UV-protected? I answered UV-protected, almost all lenses are UV-protected (90% of the products on the market are resin lenses). The customer is right, the glass is UV resistant. I answered that not all glass is UV resistant. The customer didn't believe it. In order to prove what he said, he took out the UV pen light (360nm) in the store to test the counter glass in the store, and found that it was not UV-proof. Customers still don't believe it and say that's not the case.

In order to clarify the facts, but also to improve their professionalism. Deliberately search the Internet for the following results: The ultraviolet rays radiated by the sun include UVA, UVB, and UVC bands. Earth's ozone layer blocks 97-99% of UV radiation that penetrates the atmosphere. 98.7% of the ultraviolet rays reaching the earth's surface are UVA (long-wave ultraviolet rays, wavelengths 315-400 nanometers). The transmittance of ordinary window glass for wavelengths above 350 nanometers is about 90%, but for light waves below 300 nanometers, 90% will be blocked.

To sum up, ordinary glass is anti-ultraviolet, and it is not anti-UVA, which is very harmful to the eyes. Glass lenses with full UV protection require a special process, and the process is relatively difficult. For example, most of the lenses of Ray-Ban sunglasses are made of glass, with high definition and full UV protection, which is why they are expensive. The following is a comparison of the advantages and disadvantages of resin lenses and glass lenses.

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