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About:
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The difference between photochromic lenses and Transitions lenses is that Transitions is a brand of photochromic lenses — one of several brands.
Photochromic lenses are also often referred to as transition lenses (lowercase t), hence the understandable confusion.
Let's take a closer look at the differences:
Photochromic lenses
Traditional photochromic lenses are made of plastic, glass or polycarbonate and change from transparent lenses to darker lenses when exposed to sunlight.
There are several terms used to describe photochromic lenses, including light-adaptive, light intelligent, variable tint and transition lenses.
Photochromic lenses are available in virtually all lens materials and in a variety of tints made for general-purpose lenses as well as contact lenses. Some sunglasses manufacturers even make tinted lenses that go from dark to darker shades rather than from clear to dark.
Transitions lenses
Transitions lenses are the most popular brand of photochromic eyeglass lenses sold in the United States. So some eye care practitioners even use the term "transition lenses" interchangeably with photochromic lenses (much like cotton swabs are almost universally known as Q-tips).
Transitions Gen 8 lenses, introduced in the U.S. in 2019, are the fastest light-adaptive Transitions lenses available.
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