Photochromic Sunglasses are the eyeglasses that gets darken when exposed to the sun. Created by Corning in the late 1960s and popularized by Transitions in the 1990s,these are also sometimes called photochromatic. Lenses in photochromic sunglasses rely on a specific chemical reaction to UV radiation.
You can purchase photochromic (color changing) paints at most automotive paint stores.
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they turn darker in sunlight
Photochromic lenses adjust their tint based on the light getting darker in the sun and clearing up inside. They're perfect if you want one pair of glasses that works as both sunglasses and regular glasses. You can find more details at Eyeglass Direct.
It means changing colour in resonse to light.
Photochromic Sunglasses are the eyeglasses that gets darken when exposed to the sun. Created by Corning in the late 1960s and popularized by Transitions in the 1990s,these are also sometimes called photochromatic. Lenses in photochromic sunglasses rely on a specific chemical reaction to UV radiation.
The stimulus for photochromic material is light, particularly ultraviolet (UV) light. When exposed to UV light, these materials undergo a reversible chemical change that alters their color or transparency. This property allows photochromic materials to transition between different states in response to varying light conditions, such as darkening in sunlight and returning to their original state in the absence of UV light.
Those are called photochromic lenses. They contain special molecules that react to ultraviolet light, causing the lenses to darken in brightness and clear up when UV exposure decreases.
Photochromic lenses are made by adding special light-sensitive molecules to the lens. When exposed to UV light, these molecules cause the lenses to darken in the sun and clear up when indoors. This is done by either mixing the molecules into the lens material or applying them as a coating.
Photochromic polymers are used in things like glasses, car windows, and smart windows because they change color or darken when exposed to sunlight. You’ll also find them in UV sensors, cosmetics, and security features for added functionality.
The advantages of having photochromic lens on your sunglasses are not only convenient (ability to go from outdoors to indoors with changing eyewear) but they enhance vision of patients with various ocular pathologies (diseases) and those who have light to moderate sensivity to light.