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1 maj 2024 · Because 20 feet is equivalent to 6.096 meters, 20/20 vision is equal to 6/6 vision. For example, 6/12 is a metric measurement on the Snellen test. It’s equivalent to 20/40 in feet, .50 in decimal, and .30 on the LogMAR scale.
25 cze 2019 · If you have an eye exam and are told you have 20/20 (or 6/6) vision, does this mean you have perfect eyesight? Is it possible to achieve even better than 20/20 vision? And what is "perfect vision" anyway?
You may have also heard about 6/6 vision. The only difference is depending if you are in the UK or America, as it is measured in either feet or metres. 6/6 vision describes being able to see at 6 metres what an average person can see at 6 metres.
17 mar 2020 · If you have an eye exam and are told you have 20/20 (or 6/6) vision, does this mean you have perfect eyesight? Is it possible to achieve even better than 20/20 vision? And what is "perfect vision" anyway?
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.
It is really just to do with feet and metres. 6/6 means you see at 6 metres what an average person can see at six metres, and 20/20 is the equivalent in feet, twenty feet versus twenty feet. So the average normal vision in the general population would mean that what someone sees at twenty feet an average person can see.
A "6/6" vision in the metric system or a "20/20" vision in the imperial system is a common way to describe having perfect eyesight. But what do these figures signify, and are they the pinnacle of optical acuity?
