This term expresses normal visual acuity (in other words, the sharpness, or clarity, of vision) measured at a distance of 20 feet. People with 20/20 vision can clearly see the objects that should normally be seen at 20 feet.
However, 20/20 does not necessarily mean perfect vision. The term only indicates the sharpness or clarity of vision at a distance, and does not take into account the other important vision skills that contribute to your overall visual ability. (Those skills include eye coordination, color vision, depth perception, focusing ability, and peripheral