The importance of using UV400 lenses in sunglasses is to provide a high level of UV protection, ensuring that the eyes are protected from UV damage. The UV400’s sunglasses are able to block ultraviolet light with wavelengths below 400 nanometers, which means they effectively protect the eyes from UV damage. This lens is able to provide close to 100% UV protection, which is very important for protecting eye health. When choosing sunglasses, looking for products with the UV400 logo is key to ensuring optimal UV protection.
Ultraviolet (UV) damage to the eye depends mainly on the wavelength, duration and intensity of the ultraviolet radiation, as well as the eye’s own defense mechanisms. Cornea and lens are the most frequently damaged eye tissues by ultraviolet light, while solar keratitis, corneal endothelial damage and solar cataract are the most related eye diseases. Therefore, it is particularly important to choose UV400 lenses that can block the three wavelengths of UVA, UVB, and UVC, because ordinary sunglasses can only reduce the intensity of light, but not block ultraviolet rays. If a pair of sunglasses can only block bright light but not the same amount of UV light, it may actually increase the damage to the eyes.
In addition, when buying sunglasses, you should choose lenses with UV400 markings, because this lens can resist all wavelengths of ultraviolet light, and general sunglasses can only reduce the brightness, can not block ultraviolet light. By using a UV detector you can verify that the sunglasses really have UV protection, if the sunglasses are able to block UV rays, then the UV anti-counterfeiting mark will not be visible when using the UV detector
