visual acuity

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visual acuity

Sharpness of vision, especially as tested with a Snellen chart. Normal visual acuity based on the Snellen chart is 20/20.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

vis′ual acu′ity

n..

acuteness of the vision as determined by a comparison with the normal ability to identify certain letters at a given distance, usu. 20 ft. (6 m).

[1885–90]

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Noun

visual acuity - sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart)

acuity, sharp-sightedness

visual modality, visual sense, vision, sight - the ability to see; the visual faculty

20/20, twenty-twenty - normal visual acuity, as measured by the ability to read charts at a distance of 20 feet

oxyopia - unusually acute vision

Translations

acuita visiva

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References in periodicals archive ?

The Beaver Dam eye study: visual acuity. Ophthalmology 1991;98:1310-5.

Correctable visual impairment among persons with diabetes--United States, 1999-2004

The World Health Organization (WHO/estimates that approximately 124 million people have low vision, which it defines as visual acuity between 20/60 and 20/400 with the best possible correction or a visual field of 20 degrees or less.

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Visual acuity equal to or less than 0.7 in one eye or both eyes was counted as subnormal visual acuity, according to the guidelines for school physical examinations in Korea.

The role of vision screening and classroom illumination in the vision health of Korean school children

Abnormalities were found in 16% of the 874 children screened by visual acuity and 12% of the 1,166 screened by photo-refraction, but only 161 total were referred for additional evaluation.

Primary care office-based vision screening methods often lack sensitivity, specificity: poor follow-up also a factor

More than 98% of patients reported being moderately to extremely satisfied with their visual acuity 1-year after having the lens implanted, the researchers said.

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Haider, Kundi, and Weissenbock (1982) measured visual acuity before and after the working period in order to indicate functional changes in the accommodation mechanism, and they reported that the decrease of visual acuity during work correlated well with different lengths of working periods.

A comparison of seven visual fatigue assessment techniques in three data-acquisition VDT tasks

It can affect one or both eyes, either synchronously or one at a time, within a few years.[5] In the early stages of the disease, patients tend to have good visual acuity with minor visual symptoms.

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A new study published in the Journal of the American Medical Association has compared different forms of management for patients with good visual acuity and diabetic macular oedema involving the macular centre.

Observation favoured for macular oedema patients with good visual acuity

Summary of the preliminary efficacy data (visual acuity measured using the standardized ETDRS chart, five letters per line):

Vision Improved In RP Trial Testing hRPC Cell Therapy

Of note, early data from Cohort 4 patients with earlier-stage dry-AMD and smaller areas of GA remain encouraging, with indications of the continued presence of the transplanted OpRegen cells and improvements in visual acuity. Data presented at ARVO 2019 showed that both the surgical procedure and the OpRegen cells were generally well tolerated with no unexpected adverse events or treatment-related systemic serious adverse events reported in the first fifteen patients enrolled to date.