The Difference Between UV Protection and Polarized Sunglasses

How Do Sunglasses Block UV Rays? The color and degree of darkness provided by sunglasses have nothing to do with how well they block dangerous UV rays. Lenses are treated with a clear coating that blocks UV rays, and even standard prescription eyeglasses with no tinting use lenses that have been coated to block UV. Only choose sunglasses that specify that they block 99-100% of UVA and UVB rays. If sunglasses are labeled as having “UV 400” protection, they offer good UV protection down to the shortest wavelength UV rays. Since UV radiation can damage your eyelids, corneas, lenses, and other parts of the eye, it’s essential that you choose sunglasses that block ultraviolet rays. How Do Polarized Lenses Work? When light is reflected off a surface like water, snow, or glass, the light waves “polarize,”. This means they tend to orient themselves horizontally, producing harsh glare and causing eye strain. Polarized lenses reduce the brightness of the glare without making the field of vision dimmer. How Are Polarized Lenses Made? Polarized lenses are made from thin, clear films. The film is heated and stretched, causing the long molecules that make up the film to align. The film is then … Continue reading The Difference Between UV Protection and Polarized Sunglasses