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Blue light, a type of high-energy light, is part of the visible light spectrum. High-energy visible light (HEV light) is short-wave light in the violet/blue band from 400 to 450 nm in the visible spectrum, which has a number of purported negative biological effects, namely on circadian rhythm and retinal health (blue-light hazard), which can lead to age-related macular degeneration.
[11] [12] It is an area of 4.17 steradians or 13700 square degrees for binocular vision. [13] When viewed at large angles from the side, the iris and pupil may still be visible by the viewer, indicating the person has peripheral vision possible at that angle. [14] [15] [16]
Specialized glasses may be used for viewing specific visual information, for example, 3D glasses for 3D films (stereoscopy). Sometimes glasses are worn purely for fashion or aesthetic purposes. Even with glasses used for vision correction, a wide range of fashions are available, using plastic, metal, wire, and other materials for frames.
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July 20, 2024 at 4:07 AM. Earth surrounded by a cloud of satellites. Image source: Getty Images. After years of delays, in October 2023 Amazon (NASDAQ: AMZN) took its first step toward offering ...
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