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UV400 Sunglasses are lenses designed to block 100% of all ultraviolet (UV) light wavelengths up to 400 nanometers (nm). This is the global standard for effective eye protection and is the highest level of UV coverage available in eyewear. If sunglasses do not carry a "UV400" label or a clear "100% UV Protection" certification, they are not considered safe for prolonged sun exposure.
read more about uv400 sunglasses ...The UV spectrum includes both UVB and UVA rays. UVB rays end around 315 nm, but the longer-wavelength UVA rays extend all the way up to 400 nm. Some sunglasses labeled only "UV-blocking" might only cover the UVB range. UV400 guarantees that the lens filters the entire spectrum of harmful UV light, including the long-reaching UVA rays that can damage the retina over time.
Wearing UV400 sunglasses is crucial for preventing both short-term and long-term vision damage:
Lens.com stresses that you should never choose sunglasses based on price or tint color alone. A very dark, cheap pair may only reduce visible light and offer zero UV protection, making them dangerous. Always look for the specific UV400 or 100% UV Protection sticker or label, and be aware that these filters should be applied to all your outdoor eyewear, including prescription sunglasses.
No. Polarization is a technology that reduces glare from horizontal surfaces. It is separate from UV filtration. You must ensure polarized lenses also carry the UV400 rating.
Yes. The UV filter is colorless and can be applied to or molded into completely clear prescription glasses, providing invisible protection.
An eye care professional can measure the UV blocking capability of your lenses using a device called a spectrophotometer. If your sunglasses are older or unlabelled, it’s best to have them checked.