How can my vision be more than 100 %?

Nägemisuuringu käigus kontrollivad silmaarstid alati, kui hästi näeb inimene kaugele. Vahel selgub, et nägemine on isegi rohkem kui 100% – kuidas on see võimalik?

There are many eye charts that can be used to measure vision, but the Snellen chart is the most common one. In America the doctors place the chart 20 feet away from the patient, in Europe that distance is 6 metres.

20/20 (Euroopas 1,0 ehk 100  %) nägemisteravus tähendab seda, et inimene näeb 20 jala kaugusel selgelt optotüüpe, mida "normaalse" nägemisega inimene peakski nägema 20 jala kauguselt.  20/10 nägemine aga tähendab, et inimene näeb 20 jala kauguselt objekte, mida normaalse nägemisega inimene näeb vaid 10 jala kauguselt. Juhul, kui näete vaid ülemist E-tähte tabelil, on nägemisteravus vaid 20/200 (Euroopas 0,1).

Usually the line marking 20/20 vision on the chart is the fourth from the bottom. The ones after that mark 20/15, 20/10 and 20/5 vision – that means vision that is more than 100 %. There are not many people with vision that good, but for example most birds of prey have at least 20/5 vision!

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