what does 6/12 eyesight correspond to?!


Question: What does 6/12 eyesight correspond to?
so the reuirement for merchant navy is written as 6/12 maximum with correction
so what is the power
my power is -0.75 and -1.25

Answers:

eyesight is recorded as a fraction in which the numerator denotes the distance of the subject from the chart, which is usually 6 metres, and the denominator denotes the line which the subject reads.Thus 6/12 means that from 6 metres, a person can read only that line which normally-sighted persons would have read from the distance of 12 metres.


for more info refer Visual acuity in wikipedia

http://en.wikipedia.org/wiki/Visual_acuity




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