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One child within Freckleton's Holy Trinity School would later recollect: "The sky [suddenly became] black and blue. Every colour you could think of." [n 5] To dispel the fear of the pupils in the infants' classroom, teachers Jennie Hall [37] and Louisa Hulme encouraged the children to sing nursery rhymes with them. [38]
London Biggin Hill, a former RAF station This list of former RAF stations includes most of the stations, airfields and administrative headquarters previously used by the Royal Air Force. They are listed under any former county or country name which was appropriate for the duration of operation. During 1991, the RAF had several Military Emergency Diversion Aerodrome (MEDA) airfields: RAF ...
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 ...
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.
Eye protection is protective gear for the eyes, and sometimes face, designed to reduce the risk of injury. Examples of risks requiring eye protection can include: impact from particles or debris , light or radiation , wind blast , heat , sea spray or impact from some type of ball or puck used in sports.
The history of protective eyewear goes back to 1880, when P. Johnson invented eye protectors. [6] Johnson's design used two layers of semi-opaque cloth. He had in mind that firemen, furnace-men and others exposed to intense light would use them to reduce the light intensity. They did not provide impact protection.
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