Is 13/20 Eye Vision possible?

Question

My friend was trying to tell me that she has 13/20 vision, which is supposedly better than 20/20 vision. But I always thought that vision was measured in intervals of 5. So basically, is 13/20 possible?

Answer 1

No...she has her numbers   confused... 13/20 would be fairly bad.

She probably means 20/13....in which case, would be very good.

Missing a few letters on the 20/10 line could bring her half way between the 20/10 and 20/15 lines.

Answer 2

always we say that 20/20 is the complete visual ability for seeing distance but there is some person how can see more than that and that caused by the (( accommodation)) of eye

accommodation: the ability of eye to increase it power.

the accommodation is increase in children and they can see 13/20 perfectly .........

with aging the majority of person return to 20/20