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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]
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.
Once again the patient's fixation is directed to a round letter on the chart. The 0.50JCC is presented straddling the axis of the cylinder lens in the trial frames. [6] The patient is shown the lens in both flip positions. Both options may be blurry, the patient is asked to indicate which is clearer of the two. [6]
••Snellen's near chart (1/17th reduction of distant chart)-do-; standard chart of alphabets; video link •Colour vision: to test colour vision ••Ishihara's chart: to determine the type of colour blindness Stenopaeic slit: detection of axis of the cylindrical (astigmatism) power of the eye; glaucoma testing Implants - •Intraocular lens
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Cover test c/u: Check up CW: Close work ... Intra-ocular lens IOP: Intra-ocular pressure ISNT: ... Visual acuity with eye chart at Near 15.7 inches (400 mm) and ...
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