Photochromic lenses, also known as adaptive or “transition lenses,” are intelligent lenses designed to protect the eyes from bright light and harmful ultraviolet (UV) rays. They provide a “sunglass effect,” which means they darken in bright sunlight and become clear in low light.

Often referred to as transitions or reactolights, photochromic lenses are made of many lens materials including plastic, glass or polycarbonate. They are typically used as sunglasses that conveniently switch from a clear lens indoors to a sunglasses depth tint when outdoors, and vice versa.

You carry your glasses and sunglasses wherever you go, switching back and forth each time you go outside and head back in. A simple alternative is to wear glasses with photochromic or "transition" lenses. These lenses automatically darken in bright sunlight and return to a regular tint in dimly lit environments.

PPG Industries, Inc. Petersburg, Transitions is a joint venture 51 percent owned by Pittsburgh-based PPG Industries, Inc. and 49 percent owned by the French firm Essilor International SA.

They are also known as light-adaptive lenses and variable tint lenses. 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.

Transitions XTRActive new generation lenses are recommended for wearers who are very light sensitive or frequently exposed to bright light. They deliver the best extra darkness and the best extra light protection1 from intense light indoors and outdoors, even in the car.

And once it's in you just pull out the band. Now you're going to see how these lenses transition from Clear lenses to Amber lenses. These glasses came out beautiful. And we hope you guys enjoyed.

Are there different types of Transitions Lenses? To meet the diverse needs of our consumers, we have different options of everyday lenses that can be worn indoors and outdoors all day long: Transitions lenses, Transitions ® XTRActive ® lenses, and Transitions ® Vantage ® lenses.

With transitional lenses, you can wear sunglasses while driving and still be able to read important street signs. Limits risk of losing glasses – Carrying around two pairs of glasses means that you're much more likely to lose or misplace one of them. Having only one pair makes it easier on you.

Transitions Signature GEN 8 lenses represent the pinnacle of Transition™ technology. These lenses are renowned for their exceptional responsiveness to changing light conditions. When exposed to UV light, they swiftly transition from clear to dark, providing optimal protection against the sun's harmful rays.

Transitions lenses are brand-name eyeglass lenses that darken with UV exposure and thus provide vision correction and sun protection in one pair of glasses.

Here are a few of the most popular types for your transition glasses:

• Transitions® Signature®
• Transitions® XTRActive®
• Transitions® Drivewear®
• Transitions® Vantage™
• Transitions® XTRActive® Polarized™

Transitions Optical began as a joint venture between PPG Industries and Essilor International S.A. Manufacturing in 1990 in Pinellas Park, Florida. It was the first time people could buy lightweight photochromic lenses or Transitions lenses.

PPG continued researching, testing and perfecting their product until 1989, when the company marketed the lenses under the Transitions trademark in partnership with Essilor International. The first-generation plastic photochromic lenses were produced in 1991.

around 3 years Wear & Tear Over time, photochromic lenses become less effective. They generally last around 3 years before they lose their ability to darken when exposed to UV light.

Transitions® XTRActive® new generation lenses are designed to provide light-sensitive eyes with extra protection from intense lights indoors, outdoors, and even in the car.