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A UV shield is a material or coating applied to eyewear, such as glasses or contact lenses, that acts as a protective barrier against ultraviolet (UV) radiation. This barrier either absorbs or reflects the UV light, preventing it from passing through the lens and damaging the sensitive tissues of the eye. It is an essential component for safeguarding long-term vision health.
read more about uv shield ...In everyday talk, UV shield and UV blocker are often used to mean the same thing. A shield suggests a physical barrier, which is accurate for protective eyewear. A blocker usually refers to the specific chemical agents embedded in the lens material that absorb the UV light's energy. Both achieve the same goal: stopping 100% of harmful UVA and UVB rays from reaching your eye.
UV shielding can be found in several places:
For a UV shield to be fully effective, you need a rating of UV400. This guarantees that the lens is blocking all ultraviolet rays up to 400 nanometers, which covers 100% of UVA and UVB light. Since UV light is invisible, you can't rely on the darkness or color of a lens; only the UV400 certification tells you the shield is working properly.
At Lens.com, we prioritize your eye safety by offering a wide selection of contact lenses that incorporate high-grade UV shields. We make sure the protective products you need are clearly marked and easy to order, so you can trust that your eyes are getting the 100% protection they deserve, every single day.
Do clear prescription glasses need a UV shield?
Yes. Clear lenses without a UV shield are ineffective against UV light. Since you wear them all day, it is essential that your prescription lenses include a built-in UV coating or material to protect your eyes constantly.
Can a UV shield wear off over time?
If the UV shield is a coating applied to the surface of a lens, it can potentially be scratched or damaged. However, if the blocking agent is integrated into the material of the lens (which is common for quality contacts and glass), the protection is permanent.
Does a UV shield also block blue light?
Not necessarily. A standard UV shield targets the 400nm range and below (ultraviolet). Blue light is in the higher visible light spectrum (400-500nm). To block blue light, the lens needs a separate, specialized filter.