20/20 vision is a term used to express normal visual acuity (the clarity or sharpness of vision) measured at a distance of 20 feet. If you have 20/20 vision, you can see clearly at 20 feet what should normally be seen at that distance.Visual Acuity: What is 20/20 Vision?www.aoa.org/...vision...vision.../visual-ac...American Optometric Association