vision defect

Definitions of vision defect

1. noun

   impairment of the sense of sight
   synonyms: visual defect, visual disorder, visual impairment

   types:

   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

   legal blindness

   vision 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, dichromia

   a 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, monochromia

   complete 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

   anopia

   sightlessness (especially because of a structural defect in or the absence of an eye)

   farsightedness, hypermetropia, hypermetropy, hyperopia, longsightedness

   abnormal condition in which vision for distant objects is better than for near objects

   snow-blindness, snowblindness

   temporary blindness caused by exposure to sunlight reflected from snow or ice

   annular scotoma

   a circular scotoma surrounding the center of the field of vision

   central scotoma

   a scotoma that involves the fixation point

   hemianopic scotoma

   a scotoma involving half of the visual field

   paracentral scotoma

   a scotoma that is adjacent to the fixation point

   flittering scotoma, scintillating scotoma

   a localized area of diminished vision edged by shimmering colored lights; in many people it indicates the onset of migraine

   eyelessness

   blindness due to loss of the eyes

   figural blindness

   inability to see shapes and contours

   type of:

   disability, disablement, handicap, impairment

   a condition that makes it difficult or impossible for someone to perform some physical or mental task