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Computer glasses may refer to: Blue-light blocking glasses, to try to reduce eyestrain from computer use; Smartglasses, glasses with computer technology
The American Academy of Ophthalmology (AAO) does not recommend special eyewear for computer use, [13] [14] although it recommends using prescription glasses measured specifically for computer screen distance (depending on individuals, but possibly 20–26 inches from the face), which are not the same as "blue-light blocking" glasses. [21]
A vertical bell lyre in use by the National Marching Band of the RAF Air Cadets. In the United Kingdom, the United States, and Canada, a form of glockenspiel is called a bell lyre, bell lyra, or lyra-glockenspiel. [11] The bell lyre is a form of glockenspiel commonly used in marching bands. [12]
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A study sponsored by the lens industry has shown blue light-filtering lenses decrease specific aspects of light emissions. Theoretical reductions in phototoxicity were 10.6% to 23.6%. [12] Additionally, melatonin suppression was reduced by 5.8% to 15.0% and scotopic sensitivity by 2.4% to 9.6%. Over 70% of the participants in this testing were ...
Maurice Ravel preferred the keyboard version of the instrument because it can play a true ff dynamic for brilliance and iridescence in orchestral climaxes. [3] In the late 20th century, the firm of Bergerault began manufacturing a three-octave (F 2 –E 4 ) mallet instrument with a damping mechanism operated by a foot pedal, which is capable of ...
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