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Strongly tinted sun glasses [24] or contact lenses [25] are often used to decrease luminosity. Red-tinted lenses are very common, but different hues are used to optimize the comfort of the wearer. [26] Achromats often use red filters while driving to help identify traffic lights when position cues are not sufficient. Similar to the operation of ...
A photochromic eyeglass lens, part of the lens darkened after exposure to sunlight while the other part remained covered. 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 clear state.
Glasses, also known as eyeglasses or spectacles, are vision eyewear with clear or tinted lenses mounted in a frame that holds them in front of a person's eyes, typically utilizing a bridge over the nose and hinged arms, known as temples or temple pieces, that rest over the ears for support.
Glasses (also called eyeglasses or spectacles) are frames bearing lenses worn in front of the eyes, normally for vision correction, eye protection, or for protection from UV rays. Modern glasses are typically supported by pads on the bridge of the nose and by temple arms placed over the ears .
The lenses were made to a joint standard shared by the U.S. Army Air Corps and the U.S. Navy. As a result, the lens carried an "AN" (Army/Navy) specification number: AN6531. The U.S. Government specified the shape of the lens and the color, which was initially a green-tinted lens that transmitted 50% of incoming visible daylight.
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