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Some clinics do not have 6-metre eye lanes available, and either a half-size chart subtending the same angles at 3 metres (9.8 ft), or a reversed chart projected and viewed by a mirror is used to achieve the correct sized letters. In the most familiar acuity test, a Snellen chart is placed at a standard distance: 6 metres.
Note: meters/feet not a direct conversion, but rather in Snellen equivalents (1 meter = 5 feet). Español : Test R de ETDRS, uno de tres modelos de prueba logMAR diseñados por Ferris, Kassoff, Bresnick y Bailey para su utilización en el estudio de tratamiento temprano de la retinopatía diabética, o ETDRS por sus siglas en inglés.
Near visual acuity or near vision is a measure of how clearly a person can see nearby small objects or letters.Visual acuity in general usually refers clarity of distance vision, and is measured using eye charts like Snellen chart, LogMAR chart etc. Near vision is usually measured and recorded using a printed hand-held card containing different sized paragraphs, words, letters or symbols.
An example of the Landolt C eye chart (also known as the Japanese eye chart.). Numerous types of eye charts exist and are used in various situations. For example, the Snellen chart is designed for use at 6 meters or 20 feet, and is thus appropriate for testing distance vision, while the ETDRS chart is designed for use at 4 meters. [16]
The Monoyer chart was created by Ferdinand Monoyer and is used to test visual acuity. [1] He inserted his name in the chart; reading upwards on both ends, but ...
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related to: 3 meter eye lane chart template free editable