The Human Body | What Does It Mean To Have 20/20 Vision?
What does it mean to have 20/20 vision?
While many people think that 20/20 vision is "perfect" eyesight, it is actually just "normal" eyesight. Specifically, someone with 20/20 vision can see an object 20 feet (6 meters) away with the clarity that a "normal" eye will see an object at that distance. It's possible to have better than 20/20 vision. A person who has 20/15 vision, for instance, is capable of seeing an object that's 20 feet away with the same clarity that a normal eye will see an object that's just 15 feet (4.5 meters) away.
Source: Prevention's Giant Book of Health Facts, p. 519.
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