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|Noun||1.||visual defect - impairment of the sense of sight |
amaurosis - partial or total loss of sight without pathology of the eye; caused by disease of optic nerve or retina or brain
amblyopia - visual impairment without apparent organic pathology
ametropia - (ophthalmology) faulty refraction of light rays in the eye as in astigmatism or myopia
aniseikonia - visual defect in which the shape and size of an ocular image differ in the two eyes
anorthopia - distorted vision in which straight lines appear curved
aphakia - absence of the natural lens of the eye (usually resulting from the removal of cataracts)
color blindness, color vision deficiency, colour blindness, colour vision deficiency - genetic inability to distinguish differences in hue
diplopia, double vision - visual impairment in which an object is seen as two objects; "diplopia often disappears when one eye is covered"
disability, disablement, handicap, impairment - the condition of being unable to perform as a consequence of physical or mental unfitness; "reading disability"; "hearing impairment"
quadrantanopia - blindness in one fourth of the visual field
metamorphopsia - a defect of vision in which objects appear to be distorted; usually due to a defect in the retina
moon blindness, night blindness, nyctalopia - inability to see clearly in dim light; due to a deficiency of vitamin A or to a retinal disorder
photoretinitis - damage to the retina resulting from exposure of the eye to the sun without adequate protection
detached retina, detachment of the retina, retinal detachment - visual impairment resulting from the retina becoming separated from the choroid in the back of the eye; treated by photocoagulation
scotoma - an isolated area of diminished vision within the visual field
tunnel vision - visual impairment involving a loss of peripheral vision
xanthopsia - visual defect in which objects appear to have a yellowish hue; sometimes occurs in cases of jaundice