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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.
Most people are familiar with this test, in which they read letters from a chart while seated at a certain distance. a person with normal visual acuity is said to have 20/20 vision. a person with 20/40 vision can see at a distance of 20 feet what a person with ânormalâ vision can see at 40 feet.