| 单词 | vision defect |
| 释义 | vision defect (once / 11819311 pages) n WORD FAMILY vision defect n impairment of the sense of sight Syn|Hypo|Hyper visual defect, visual disorder, visual impairment amaurosis partial or total loss of sight without pathology of the eye; caused by disease of optic nerve or retina or brain amblyopiavisual impairment without apparent organic pathology ametropia(ophthalmology) faulty refraction of light rays in the eye as in astigmatism or myopia aniseikoniavisual defect in which the shape and size of an ocular image differ in the two eyes anorthopiadistorted vision in which straight lines appear curved aphakiaabsence of the natural lens of the eye (usually resulting from the removal of cataracts) blindness, cecity, sightlessnessthe state of being blind or lacking sight color blindness, color vision deficiency, colour blindness, colour vision deficiencygenetic inability to distinguish differences in hue diplopia, double visionvisual impairment in which an object is seen as two objects day blindness, hemeralopiainability to see clearly in bright light hemianopia, hemianopsiablindness in one half of the visual field of one or both eyes quadrantanopiablindness in one fourth of the visual field metamorphopsiaa defect of vision in which objects appear to be distorted; usually due to a defect in the retina moon blindness, night blindness, nyctalopiainability to see clearly in dim light; due to a deficiency of vitamin A or to a retinal disorder photoretinitisdamage to the retina resulting from exposure of the eye to the sun without adequate protection detached retina, detachment of the retina, retinal detachmentvisual impairment resulting from the retina becoming separated from the choroid in the back of the eye; treated by photocoagulation scotomaan isolated area of diminished vision within the visual field tunnel visionvisual impairment involving a loss of peripheral vision xanthopsiavisual defect in which objects appear to have a yellowish hue; sometimes occurs in cases of jaundice legal blindnessvision that is 20/200 or worse in both eyes (20/200 vision is the ability to see at 20 feet what a normal eye can see at 200 feet) dichromacy, dichromasy, dichromatism, dichromatopsia, dichromiaa 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) monochromacy, monochromasy, monochromatic vision, monochromatism, monochromiacomplete color blindness; colors can be differentiated only on the basis of brightness myopia, nearsightedness, shortsightedness(ophthalmology) eyesight abnormality resulting from the eye's faulty refractive ability; distant objects appear blurred astigmatism, astigmia(ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people anopiasightlessness (especially because of a structural defect in or the absence of an eye) farsightedness, hypermetropia, hypermetropy, hyperopia, longsightednessabnormal condition in which vision for distant objects is better than for near objects snow-blindness, snowblindnesstemporary blindness caused by exposure to sunlight reflected from snow or ice annular scotomaa circular scotoma surrounding the center of the field of vision central scotomaa scotoma that involves the fixation point hemianopic scotomaa scotoma involving half of the visual field paracentral scotomaa scotoma that is adjacent to the fixation point flittering scotoma, scintillating scotomaa localized area of diminished vision edged by shimmering colored lights; in many people it indicates the onset of migraine eyelessnessblindness due to loss of the eyes figural blindnessinability to see shapes and contours disability, disablement, handicap, impairment the condition of being unable to perform as a consequence of physical or mental unfitness |
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