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Usually, 20/20 vision is regarded as normal eyesight. However, it is stated to define the lucidity through which a person views something from a 20 feet distance. Whereas, 20/15 eyesight means that you may view something from a 20 feet distance, which an individual with normal eyesight might see clearly from 15 feet.
So, while a person with 20/200 (or worse) vision can see some things, like big shapes, colors, movement, they can't see it in any great detail unless they are very close to it. The second part of the definition is visual field.