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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 ...
Consequently, amblyopia is the world's leading cause of child monocular vision loss, which is the damage or loss of vision in one eye. [59] In the best case scenario, which is very rare, properly treated amblyopia patients can regain 20/40 acuity. [59] Corneal opacification; Degenerative myopia
It is especially vital to assess a child's contrast sensitivity at a young age in order to determine the distance and accuracy with the child can distinguish facial features. A very popular test designed specifically for this reason is the "Hiding Heidi Low Contrast Face Pictures" test (which the LEA Vision Test System produces a version of.)
The standard definition of normal visual acuity (20/20 or 6/6 vision) is the ability to resolve a spatial pattern separated by a visual angle of one minute of arc. The terms 20/20 and 6/6 are derived from standardized sized objects that can be seen by a "person of normal vision" at the specified distance.
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Three lines above, the letters have twice the height of those letters on the 6/6 (or 20/20 in the US) line. If this is the smallest line a person can read, the person's acuity is "6/12" ("20/40"), meaning that this person needs to approach to a distance of 6 metres (20 ft) to read letters that a person with normal acuity could read at 12 metres ...
20/20 eyesight; if below 20/40 should see a professional. The most common vision problem during middle childhood is myopia, or nearsightedness. [4] Uses 6,700 to 7,100 kJ (1,600 to 1,700 kcal) a day. Motor development. Gains greater control over large and fine motor skills; movements are more precise and deliberate, though some clumsiness persists.
Jack Levine writes about the life lessons he learned from his dad, who lost his sight when Levine was a young child.