Snellen chart

Snel·len chart

S0510150 (snĕl′ən)n. A chart for testing visual acuity, usually consisting of letters, numbers, or pictures printed in lines of decreasing size that a patient identifies from a fixed distance.

[After Herman Snellen (1834-1908), Dutch ophthalmologist.]

Thesaurus

Noun

Snellen chart - display consisting of a printed card with letters and numbers in lines of decreasing size; used to test visual acuitydisplay, presentation - a visual representation of something

Snellen chart

(snĕl′ən)n. A chart for testing visual acuity, usually consisting of letters, numbers, or pictures printed in lines of decreasing size that a patient identifies from a fixed distance.

Snellen chart

A wall chart developed by a Dutch ophthalmologist Hermann Snellen in the 19th century, which is still used today to measure visual acuity. It consists of 11 lines of block letters of decreasing size, which are to be read at a distance of 6 metres (20 feet). Per the British Standards Institution, only letters C, D, E, F, H, K, N, P, R, U, V, and Z should be used for the testing of vision based on the letters’ equal legibility. Snellen defined standard vision as the ability to recognise a letter (“optotype”) when it forms an angle of 5 arcminutes, which is “line nine” of the letters (“optotypes”) on the chart at 6 metres.

Snellen,

Hermann, Dutch ophthalmologist, 1834-1908. Snellen chart - used to test visual acuity.Snellen conventional reform implantSnellen entropion forcepsSnellen eye implantSnellen lettersSnellen operationSnellen reform eyeSnellen sign - bruit heard on auscultation over the eye in a patient with Graves disease.Snellen soft contact lensSnellen sutureSnellen test types - square black symbols employed in testing the acuity of distant vision.Snellen vectis

Snellen chart

Snel·len chart

Snellen chart

Snellen chart

Snellen chart

Snellen,

Snellen chart

Words related to Snellen chart

noun display consisting of a printed card with letters and numbers in lines of decreasing size

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