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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.
The 20/20 line in the eye chart indicates the size of print a person with normal vision could read when he stands 20 feet away. Although we use foot as the unit of measurement in above illustration, we can also express it in metre. This is best illustrated in the table below. The 20/20 vision is equivalent to 6/6.