A photochromic lens is an optical lens that darkens on exposure to light of sufficiently high frequency, most commonly ultraviolet (UV) radiation. In the absence of activating light, the lenses return to their …

WebMD explains how photochromic lenses work, their benefits, and the different types. Learn how they protect your eyes and improve vision in various lighting conditions.

Dec 9, 2024 · Photochromic lenses, sometimes referred to as transition lenses, are eyeglass lenses that will turn dark (resembling sunglasses) in sunlight and become clear again when indoors.

Jan 30, 2025 · 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 …

Jun 28, 2023 · Photochromic lenses are eyeglass lenses that are clear (or nearly clear) indoors and darken automatically when exposed to sunlight. Other terms sometimes used for photochromic …

Apr 29, 2025 · Photochromic lenses are lenses that stay transparent indoors, but darken when exposed to ultraviolet light from the sun. Essentially, they provide the benefits of glasses and sunglasses in a …

Aug 30, 2025 · Often mistakenly termed “photochromatic lenses,” photochromic lenses refer to optical lenses that automatically adjust their tint to ambient light. These adaptive lenses transition from clear …

Photochromic lenses, often referred to as transition lenses, are designed to automatically darken when exposed to UV light and return to a clear state in lower light conditions.

The term “photochromism” or “photochromic” is believed to originate from the Greek words φωτόϛ (photos) and χρῶμα (chroma), which mean light and color, respectively. The photochromism can …

Sep 19, 2024 · Photochromic lenses, also known as light-adaptive or variable tint lenses, are optical lenses that automatically change in response to different light exposures, usually ultraviolet (UV) …