visual defect

1. is a type of: disability, disablement, handicap, impairment - the condition of being unable to perform as a consequence of physical or mental unfitness
   subtypes:

   • 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)
   • blindness, cecity, sightlessness - the state of being blind or lacking sight
   • 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
   • day blindness, hemeralopia - inability to see clearly in bright light
   • hemianopia, hemianopsia - blindness in one half of the visual field of one or both eyes
   • 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
   same as: vision defect, visual disorder, visual impairment

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