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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.
J2 is considered the equivalent of 20/20 distance visual acuity at the reading distance indicated on the card (usually 12 to 14 inches from your eyes). The chart can be used in two different ways, depending on what your eye doctor is trying to measure: 1  The chart is held at a specified reading distance (such as 12 inches) and you are asked to read the passage with the smallest type you can see.