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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.
A vision of 20/200 (you can only see at 20 feet what the normal average person can at 200 feet) is the threshold for blindness or severe visual impairment in most countries. When the vision is so poor that even the top line cannot be read, then you can move closer to the Snellen chart.