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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.
So a person with 20/10 vision would use the calculation: which gives a result of .5 arc minutes. For a person with 20/10 vision (or .5 arc minutes), this translates to .000145444 radians. With the angular resolution in radians, we can then determine the pixel pitch you are able to see at a set distance. To do this, we need to use part of SOHCAHTOA: