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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.
If your vision is 20/40 (or 6/12) it means that a letter size that a person with normal vision can see when it is 40 feet (or 12 metres) away, you can only see it when it is much nearer, at 20 feet.