Are the lenses that change colors OK for sunglasses?
A popular lens in plastics are called Transitions Lenses. When they’re exposed to ultraviolet light, they become darker or change to a different color. However most brands are not as effective in a car or in any vehicle with the “blue or gray stripe” on a windshield. Because of the ultraviolet blocking nature of the windshields, lenses will remain pretty light when you’re driving. The ultimate sunglass experience can be enjoyed with “Polarized” lenses as these lenses offer the most protection and comfort to the eye so strain and fatigue can become a thing of the past. Transitions is a registered trademark of Transitions Optical, Inc.