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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 ...
The largest letter on an eye chart often represents an acuity of 6/60 (20/200), the value that is considered "legally blind" in the US. Many individuals with high myopia cannot read the large E without glasses, but can read the 6/6 (20/20) line or 6/4.5 (20/15) line with glasses. By contrast, legally blind individuals have a visual acuity of 6/ ...
A shortsighted person who wears his/her –4 Diopter eye glasses will typically have 20/20 vision or better. A far sighted person of +4 Diopters will have 20/20 vision or better even without wearing his/her glasses provided things are sufficiently far away. A presbyopic person needs reading glasses, but, again, acuity will be normal once the ...
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I have 20/20 vision, so wearing glasses that I don’t technically need to see is absolutely not happening—unless, of course, the glasses are stylish and cool enough for me to want to wear them.
Snellen chart. The Snellen chart, which dates back to 1862, is also commonly used to estimate visual acuity.A Snellen score of 6/6 (20/20), indicating that an observer can resolve details as small as 1 minute of visual angle, corresponds to a LogMAR of 0 (since the base-10 logarithm of 1 is 0); a Snellen score of 6/12 (20/40), indicating an observer can resolve details as small as 2 minutes of ...
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