![]() ![]() They shield eyes from 100 percent of the harmful ultraviolet rays from the sun. Direct sunlight is not required for them to work. UV rays can penetrate clouds, which is why photochromic lenses are capable of darkening on cloudy days. Photochromic lenses work the way they do because the molecules that are responsible for the darkening of the lenses are activated by the ultraviolet radiation in sunlight. As a result, the terms photochromic lenses and transition lenses are sometimes used interchangeably, even though there are other brands of photochromic lenses on the market. Photochromic lenses are also known as transition lenses because the most popular brand of this kind of lens in the United States is sold by Transitions Optical. ![]() They are also known as light-adaptive lenses and variable tint lenses. Effectively, they are normal eyeglasses that transition to sunglasses, to allow for improved visibility in the absence or presence of light. Photochromic lenses are eyeglasses lenses that are designed to be clear (or almost entirely clear) indoors, and to automatically darken in outdoor, bright conditions. They can even cut down on the harmful glare of electronic devices. Photochromic lenses are very useful for driving, sports, and outdoor activities. is Transitions Optical, which is why photochromic lenses are commonly referred to as transition lenses. The most popular manufacturer of photochromic lenses in the U.S. Can Prescription Lenses Be Made with Photochrhealtomic Lenses?. ![]()
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