About Photochromic Lenses

Photochromic lens technology—the ability of a lens to darken in the presence of invisible UV light—has been around for over 40 years. Photochromic lenses change from clear to dark based on the intensity of UV radiation. Remove the source of UV radiation from the lenses, and they return to their clear state.

The amount of photochromic reaction (how much a lens darkens) depends upon the intensity of the UV radiation present, combined to a lesser extent with the current temperature of the air. That means photochromics adjust automatically to indoor and outdoor light conditions. They automatically adjust to outdoor lighting conditions by providing the right level of tint, and return automatically to their clear state; both indoors and at night.

It’s important to note that photochromic lenses are designed for COMFORT and may not replace sunglasses when you are driving. 

Research shows that only 13% of people associate extended exposure to the sun with damage to their eyes—as compared to 70% who recognize the danger to their skin. Make sure you select photochromic lenses that block 100% of harmful UV rays for your eyes, an important factor when considering eye health and healthy sight as a vital part of a lens purchase.

Source: Transitions Optical, Inc.