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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.
Blue-light-blocking glasses are said to help reduce eye strain and headaches — are they for you?
Studies have been conducted on blue light filtering eyeglasses, [5] [27] which uses special blue light blocking lenses for eye protection against blue light. [ 27 ] [ 28 ] All visible light wavelengths can be transmitted through the spectacle lens, [ 28 ] but some portions of the blue-violet light spectrum are selectively attenuated by coating ...
The ACASS number was abolished when the ACASS system transitioned to a modernized platform on October 5, 2005. The ACASS system now uses the D.U.N.S. number, in place of an ACASS number. Firms should supply their DUNS number, and notify the requestor of the discontinuation of the ACASS number, when asked for their ACASS number.
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