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Visual Acuity
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Definition of 'Visual Acuity'

Clarity or sharpness of OCULAR VISION or the ability of the eye to see fine details. Visual acuity depends on the functions of RETINA, neuronal transmission, and the interpretative ability of the brain. Normal visual acuity is expressed as 20/20 indicating that one can see at 20 feet what should normally be seen at that distance. Visual acuity can also be influenced by brightness, color, and contrast.

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Sunday, November 08, 2009

Long-term outcomes of repeat vs initial trabeculectomy in open-angle glaucoma.

30 Oct 2009 PURPOSE: To evaluate the long-term intraocular pressure (IOP) control and to identify risk factors for failure of repeat trabeculectomy with mitomycin C (MMC) in patients with open-angle glaucoma. DESIGN: Retrospective case-control study. METHODS: ... Read more...


The cost of care for people with impaired vision in Australia.

29 Sep 2009 OBJECTIVE: To prospectively collect data on the providers, types, and costs of care for people with impaired vision in Australia. METHODS: Adults with impaired vision, visual acuity worse than 20/40, were recruited from clinics, vision ... Read more...


Prevalence and causes of visual impairment in Chinese adults in urban southern China.

29 Sep 2009 OBJECTIVE: To assess the prevalence and causes of visual impairment and blindness in adults living in an urban area of southern China. METHODS: Random cluster sampling was used to identify the adults 50 years and older living in the Liwan district ... Read more...

 

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Technical information about 'Visual Acuity'

Definition: Clarity or sharpness of OCULAR VISION or the ability of the eye to see fine details. Visual acuity depends on the functions of RETINA, neuronal transmission, and the interpretative ability of the brain. Normal visual acuity is expressed as 20/20 indicating that one can see at 20 feet what should normally be seen at that distance. Visual acuity can also be influenced by brightness, color, and contrast.

Descriptor UI: D014792

Alternative terms: Visual Acuity; Acuities, Visual; Acuity, Visual; Visual Acuities;

Related Mesh Headings: Refraction, Ocular; Refractive Errors;

Allowable Qualifiers: drug effects; genetics; immunology; physiology; radiation effects;

Tree Number: E01.370.380.850.950; F02.463.593.932.901; G14.940;

History Note: 70(68)

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