But that doesn't mean they offer less protection. Even clear lenses can be coated with a colorless layer of UV protection, Valline says. The darkness of the lens isn't directly related to radiation protection, as UV rays aren't the bright rays from which dark shades shield us. If the sun's glare is bringing you down, polarized lenses can help, particularly when glare reflects off surfaces like car windows or water. These lenses are analogous to Venetian blinds, Valline explains, because they only let light in from one angle, minimizing glare that makes us squint and contributes to eye fatigue, strain and wrinkles.
Polarized lenses are available as clip-ons, too, and offer UV protection as well.
Glare can also be minimized by treating the inside of lenses with the same anti-reflective coating traditionally used on the outer side. As for frame shape, the closer shades fit, the less light enters the eye area. Whether you opt for mass-market, chintzy '70s shades or the sleek designer creations elegantly displayed at Visage, don't forget to clean those lenses.