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- Visual_acuity abstract "Visual acuity (VA) is acuteness or clearness of vision, which is dependent on optical and neural factors, i.e., (i) the sharpness of the retinal focus within the eye, (ii) the intactness and functioning of the retina, and (iii) the sensitivity of the interpretative faculty of the brain.A common cause of low visual acuity is refractive error (ametropia), or errors in how the light is refracted in the eyeball. Causes of refractive errors include aberrations in the shape of the eyeball, the shape of the cornea, and reduced flexibility of the lens. In the case of pseudomyopia, the aberrations are caused by muscle spasms. Too high or too low refractive error (in relation to the length of the eyeball) is the cause of nearsightedness (myopia) or farsightedness (hyperopia) (normal refractive status is referred to as emmetropia). Other optical causes are astigmatism or more complex corneal irregularities. These anomalies can mostly be corrected by optical means (such as eyeglasses, contact lenses, laser surgery, etc.).Neural factors that limit acuity are located in the retina or the brain (or the pathway leading there). Examples for the first are a detached retina and macular degeneration, to name just two. A common impairment where the brain (i.e. the primary visual cortex) is involved is amblyopia. In some cases, low visual acuity is caused by brain damage, such as from traumatic brain injury or stroke. When optical factors are corrected for, acuity can be considered as being a measure of neural well-functioning.Visual acuity is typically measured while fixating, i.e. as a measure of central (or foveal) vision, for the reason that it is highest there. However, acuity in peripheral vision can be of equal (or sometimes higher) importance in everyday life. Acuity declines towards the periphery in an inverse-linear (i.e. hyperbolic) fashion.".
- Visual_acuity thumbnail Snellen_chart.svg?width=300.
- Visual_acuity wikiPageExternalLink how-visual-acuity-is-measured.
- Visual_acuity wikiPageExternalLink index.html.
- Visual_acuity wikiPageExternalLink KallSpatial.html.
- Visual_acuity wikiPageExternalLink sch1b.html?stem=0&synonyms=0&query=visual+acuity.
- Visual_acuity wikiPageExternalLink icovisualacuity1984.pdf.
- Visual_acuity wikiPageExternalLink visualacuity.htm.
- Visual_acuity wikiPageExternalLink strasburger.html.
- Visual_acuity wikiPageID "648954".
- Visual_acuity wikiPageRevisionID "606265859".
- Visual_acuity hasPhotoCollection Visual_acuity.
- Visual_acuity sign "Table 13, Schedule 1B".
- Visual_acuity source sch1b.html?stem=0&synonyms=0&query=visual+acuity.
- Visual_acuity text "A person meets the criteria for permanent blindness under section 95 of the Social Security Act if the corrected visual acuity is less than 6/60 on the Snellen Scale in both eyes or there is a combination of visual defects resulting in the same degree of permanent visual loss.".
- Visual_acuity subject Category:Medical_signs.
- Visual_acuity subject Category:Ophthalmology.
- Visual_acuity subject Category:Optometry.
- Visual_acuity subject Category:Visual_perception.
- Visual_acuity comment "Visual acuity (VA) is acuteness or clearness of vision, which is dependent on optical and neural factors, i.e., (i) the sharpness of the retinal focus within the eye, (ii) the intactness and functioning of the retina, and (iii) the sensitivity of the interpretative faculty of the brain.A common cause of low visual acuity is refractive error (ametropia), or errors in how the light is refracted in the eyeball.".
- Visual_acuity label "Acuidade visual".
- Visual_acuity label "Acuité visuelle".
- Visual_acuity label "Acutezza visiva".
- Visual_acuity label "Agudeza visual".
- Visual_acuity label "Gezichtsvermogen".
- Visual_acuity label "Sehschärfe".
- Visual_acuity label "Visual acuity".
- Visual_acuity label "Visus".
- Visual_acuity label "حدة البصر".
- Visual_acuity label "視力".
- Visual_acuity label "視力".
- Visual_acuity sameAs Sehschärfe.
- Visual_acuity sameAs Agudeza_visual.
- Visual_acuity sameAs Acuité_visuelle.
- Visual_acuity sameAs Acutezza_visiva.
- Visual_acuity sameAs 視力.
- Visual_acuity sameAs 시력.
- Visual_acuity sameAs Gezichtsvermogen.
- Visual_acuity sameAs Visus.
- Visual_acuity sameAs Acuidade_visual.
- Visual_acuity sameAs m.02_g1v.
- Visual_acuity sameAs Q555066.
- Visual_acuity sameAs Q555066.
- Visual_acuity wasDerivedFrom Visual_acuity?oldid=606265859.
- Visual_acuity depiction Snellen_chart.svg.
- Visual_acuity isPrimaryTopicOf Visual_acuity.
