Can one have 20-40? What does it mean to have normal vision? What does the by merator and denominator mean?
In: Biology
20-20 vision is “normal” unimpaired vision. Specifically, it means that someone with that vision sees something 20 feet way as clearly as someone with normal vision can.
20-40 vision means that they see something 20 feet away as clearly as someone with normal vision would see it from 40 feet away.
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