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  2. Snellen chart - Wikipedia

    en.wikipedia.org/wiki/Snellen_chart

    In the most familiar acuity test, a Snellen chart is placed at a standard distance: 6 metres. At this distance, the symbols on the line representing "normal" acuity subtend an angle of five minutes of arc, and the thickness of the lines and of the spaces between the lines subtends one minute of arc.

  3. 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.

  4. Eye chart - Wikipedia

    en.wikipedia.org/wiki/Eye_chart

    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]

  5. Cover test - Wikipedia

    en.wikipedia.org/wiki/Cover_test

    Whereas for adults a small Snellen chart letter or number can be used. [1] Distance Targets (6m) Spotlight – In those patients with amblyopia a spotlight could be used. (Same as near targets). [1] Snellen chart – This is the most commonly used target when assessing a patient's far component of a cover test. [1]

  6. Subjective refraction - Wikipedia

    en.wikipedia.org/wiki/Subjective_refraction

    The patient is seated at a 6-metre distance from the Snellen Chart. [3] The illumination in the testing room is at a comfortable level of brightness for an indoor setting [3] Trial frames fitted comfortably on the patient and occluder over left eye.

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