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any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes A , antiophthalmic factor , axerophthol , vitamin A
vision using the rods achromatic vision
sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart) acuity , sharp-sightedness , visual acuity
circular scotoma surrounding the center of the field of vision annular scotoma
distorted vision in which straight lines appear curved anorthopia
tiredness of the eyes caused by prolonged close work by a person with an uncorrected vision problem asthenopia , eyestrain
distortion of vision astigmatism
English scientist and Franciscan monk who stressed the importance of experimentation; first showed that air is required for combustion and first used lenses to correct vision (1220-1292) Bacon , Roger Bacon
anything serving to maintain separation by obstructing vision or access barrier
vision involving the use of both eyes binocular vision
without vision blind
side on which your vision is limited or obstructed blind side
vision using the fovea and parafovea central vision
glaucoma caused by blockage of the canal of Schlemm; produces gradual loss of peripheral vision chronic glaucoma , open-angle glaucoma
thin curved glass or plastic lens designed to fit over the cornea in order to correct vision or to deliver medication contact , contact lens
any barrier to communication or vision curtain
United States neuroscientist noted for his studies of the neural basis of vision (born in 1926) David Hubel , Hubel
pleasant vision while awake daydream
normal vision in daylight; vision with sufficient illumination that the cones are active and hue is perceived daylight vision , photopic vision
deficiency of color vision in which the person can match any given hue by mixing only two other wavelengths of light (as opposed to the three wavelengths needed by people with normal color vision) dichromacy , dichromasy , dichromatism , dichromatopsia , dichromia
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