Distance Visual Acuity
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visual acuity — n. the ability of the eye to discriminate detail, usually tested by comparison with the power of the normal eye to distinguish certain letters on a standard chart at a given distance, generally 20 feet … English World dictionary
Visual acuity — 20/15 and 20/15 vision redirect here. For other uses, see 2020 (disambiguation). Typical Snellen chart used for visual acuity testing. Visual acuity (VA) is acuteness or clearness of vision, which is dependent on the sharpness of the retinal… … Wikipedia
Visual acuity test — 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
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
visual acuity — Ophthalm. acuteness of the vision as determined by a comparison with the normal ability to define certain letters at a given distance, usually 20 ft. (6 m). Abbr.: V. [1885 90] * * * … Universalium
visual acuity — vis′ual acu′ity n. oph 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) • Etymology: 1885–90 … From formal English to slang
Visual impairment — Classification and external resources ICD 10 H54 ICD … Wikipedia
acuity — 1. Sharpness, clearness, distinctness. 2. Severity. [thr. Fr., fr. L. acuo, pp. acutus, sharpen] absolute intensity threshold a. the minimal light that can be seen. resolution a. detection of a target having two or more parts, often measured by… … Medical dictionary
Visual angle — The visual angle is the angle a viewed object subtends at the eye, usually stated in degrees of arc.It also is called the object s angular size. The sketch helps to define it 1,2It shows an observer s eye looking at a frontal extent (the vertical … Wikipedia
Visual Angle Illusion — The visual angle, V degrees, subtended by a viewed object sometimes looks larger or smaller than its actual value, creating a visual angle illusion (V illusion).These V illusions have been explicitly described by many vision researchers,… … Wikipedia
Acuity test, visual — 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
