Visual acuity

Visual acuity
The clarity or clearness of the vision, a measure of how well a person sees. The ability to distinguish details and shapes of objects; also called central vision. The word "acuity" comes from the Latin "acuitas" = sharpness.

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visual acuity n the relative ability of the visual organ to resolve detail that is usu. expressed as the reciprocal of the minimum angular separation in minutes of two lines just resolvable as separate and that forms in the average human eye an angle of one minute compare MINIMUM SEPARABLE, MINIMUM VISIBLE

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sharpness of vision: the degree to which a person is able to distinguish and resolve fine detail. Visual acuity depends on how well objects are illuminated and upon such factors as practice and motivation, but the essential requirements are a healthy retina and the ability of the eye to focus incoming light to form a sharp image on the retina. Acuity of distant vision is often expressed as a Snellen score (see Snellen chart); acuity of near vision as a Jaeger score (see Jaeger test types).

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(V) (VA) the ability to discriminate visually between forms, measured by Snellen test type or, sometimes, by Landolt rings.

Medical dictionary. 2011.

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  • visual acuity — noun sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart) • Syn: ↑acuity, ↑sharp sightedness • Derivationally related forms: ↑sharp sighted (for: ↑sharp sightedness) …   Useful english dictionary

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  • visual acuity — noun Date: 1889 the relative ability of the visual organ to resolve detail that is usually expressed as the reciprocal of the minimum angular separation in minutes of two lines just resolvable as separate and that forms in the average human eye… …   New Collegiate Dictionary

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  • Test, visual acuity — This test measures how well you see at various distances. It is the familiar eye chart test. The eye chart itself the usual one is called Snellen s chart is imprinted with block letters that line by line decrease in size, corresponding to the… …   Medical dictionary

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