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  2. Snellen chart - Wikipedia

    en.wikipedia.org/wiki/Snellen_chart

    A person taking the test covers one eye from 6 metres or 20 feet away, and reads aloud the letters of each row, beginning at the top. The smallest row that can be read accurately indicates the visual acuity in that specific eye. The symbols on an acuity chart are formally known as "optotypes". Variation of Snellen chart with another letter ...

  3. Eye chart - Wikipedia

    en.wikipedia.org/wiki/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] There is often also a need to test a subject's vision at near or occupational tasks ...

  4. Near visual acuity - Wikipedia

    en.wikipedia.org/wiki/Near_visual_acuity

    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.

  5. Amsler grid - Wikipedia

    en.wikipedia.org/wiki/Amsler_grid

    In the test, the person looks with each eye separately at the small dot in the center of the grid. Patients with macular disease may see wavy lines or some lines may be missing. Amsler grids are supplied by ophthalmologists, optometrists or from web sites, and may be used to test one's vision at home. The original Amsler grid was black and white.

  6. List of optometric abbreviations - Wikipedia

    en.wikipedia.org/wiki/List_of_optometric...

    Vision (unaided) VA Visual acuity VA Dcc - VA Dsc Visual acuity with Distant chart with correctors Visual acuity with eye chart at Distant 20 feet (6 m) and with (cc: Latin cum correctore) correctors (spectacles); Dsc is without (sc: Latin sine correctore) correctors. See Visual_acuity#Legal_definitions: VA Nsc - VA Ncc

  7. Herman Snellen - Wikipedia

    en.wikipedia.org/wiki/Herman_Snellen

    Netherlands Hospital for Eye Patients Typical Snellen chart to estimate visual acuity Herman Snellen ( Dutch pronunciation: [ˈɦɛrmɑn ˈsnɛlə(n)] , February 19, 1834 – January 18, 1908) was a Dutch ophthalmologist who in 1862 introduced the Snellen chart to study visual acuity .

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