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A reference value above which visual acuity is considered normal is called 6/6 vision, the USC equivalent of which is 20/20 vision: At 6 metres or 20 feet, a human eye with that performance is able to separate contours that are approximately 1.75 mm apart. [9] Vision of 6/12 corresponds to lower performance, while vision of 6/3 to better ...
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 ...
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]
Form deprivation myopia occurs when the eyesight is deprived by limited illumination and vision range, [75] or the eye is modified with artificial lenses [76] or deprived of clear form vision. [77] In lower vertebrates, this kind of myopia seems to be reversible within short periods of time.
The family of a cyclist killed by an 82-year-old driver have called on elderly motorists to check their eyesight to prevent other families suffering the “pain and devastation” they have endured.
A good driving record will be necessary to progress to the next licence stage. As of July 2007, newly issued Queensland drivers licences have new restrictions for those under 25. Learners must first log 100 hours of driving experience (of which 10 must be undertaken at night) before taking their practical driving examination.
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