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A UV Filter is a substance, chemical, or coating applied to or mixed into a lens material that works to absorb or block ultraviolet (UV) radiation. UV filters are essential components of modern sunglasses and many clear prescription lenses and contact lenses. Unlike dark tints, a UV filter does not need to change the color of the lens to work; its function is solely to stop the invisible UV light waves.
read more about uv filter ...UV filters operate by incorporating special molecules into the lens material. These molecules are designed to preferentially absorb UV wavelengths (UVA and UVB) and convert the energy into heat, preventing the UV light from passing through to your eye. There are two main ways a filter is applied to a lens:
No. The best UV filters provide "UV400 protection", meaning they block all UV light rays up to 400 nanometers (nm), covering 100% of UVA and UVB. Lesser filters might only block UV up to 380 nm, leaving a small gap where some UVA rays can still penetrate. When shopping for eyewear, always look for the "UV400" label or "100% UV Protection."
The primary purpose of a tint is to reduce visible light and improve comfort, while the primary purpose of a UV filter is to protect the health of the eye. A dark tint without a UV filter is actually dangerous because it causes the pupil to open wider to the dark environment, letting in a higher dose of unfiltered UV light. The filter is the critical component for eye safety.
If the UV filtration is integrated into the mass of the lens material (which is common with polycarbonate and high-index lenses), it will not wear off. If it is a coating, it may be damaged by heavy scratching.
Yes. Even on cloudy days or indoors near windows, UV exposure can occur. A clear UV filter protects the health of your eyes year-round without altering your vision.
No. An anti-reflective coating reduces glare from visible light, whereas a UV filter blocks invisible UV light. They are two separate coatings or functions, but they are often applied together.