The common term for the human condition of 20/20 vision is "normal vision" or "normal visual acuity." This term means that a person can see at 20 feet what a person with normal vision can see at the same distance. The measurement is part of a standard visual acuity test and indicates clarity and sharpness of vision. A person with 20/20 vision can discern letters or symbols on an eye chart designed for that purpose at a distance of 20 feet. While 20/20 is often considered optimal, some individuals may have sharper vision, such as 20/15 or 20/10.