Landolt rings

Landolt rings: broken rings used in testing of visual acuity, the width of the ring and the break in its continuity each being one-fifth of its overall diameter; the observer is to identify the orientation of the break, with the ability to identify a break subtending 1 minute of arc corresponding to 20/20 vision.

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Landolt ring — Lan·dolt ring län dōlt .riŋ n one of a series of incomplete rings or circles used in some eye charts to determine visual discrimination or acuity Landolt Edmond (1846 1926) French ophthalmologist. Landolt and Louis de Wecker (1832 1906) published … Medical dictionary
landolt ring — noun Usage: usually capitalized L Etymology: after Edmond Landolt died 1926 French ophthalmologist : one of a series of incomplete rings or circles used in studying visual discrimination or acuity … Useful english dictionary
anillo de Landolt — Eng. Landolt s rings Ver Test de los optotipos de Landolt … Diccionario de oftalmología
anillos quebrados de Landolt — Eng. Landolt s broken rings Ver prueba de los optotipos de Landolt … Diccionario de oftalmología
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. * * * visual acuity n the … Medical dictionary
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