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(ophthalmology) faulty refraction of light rays in the eye as in astigmatism or myopia ametropia
angle between a refracted ray and a line perpendicular to the surface between the two media at the point of refraction angle of refraction
optical illusion in which atmospheric refraction by a layer of hot air distorts or inverts reflections of distant objects mirage
ophthalmoscope with a layer of water to neutralize the refraction of the cornea orthoscope
arc of colored light in the sky caused by refraction of the sun's rays by rain rainbow
physical property of a medium as determined by its index of refraction refractiveness , refractivity
twinkling of the stars caused when changes in the density of the earth's atmosphere produce uneven refraction of starlight scintillation
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