A person with 20/25 vision can stand 20 feet from an eye chart and see the same detail as a person who has 20/20 vision that stands 25 feet from the same chart, according to Divyesh Eye Hospital. The term "20/25 vision" is used to describe the quality of a person's vision compared to someone with 20/20 vision, which is considered “normal” or “average” vision.Know More
Divyesh Eye Hospital explains that 20/20 vision is not necessarily “perfect” vision although some people believe that to be the case. Rather, this figure is used for comparison purposes. Some people can see better than 20/20. For example, someone with 20/15 vision can see at 20 feet what the average person can see at 15 feet. Alternatively, someone with 20/40 vision must stand 20 feet away from the eye chart to see the same amount of detail that a person with 20/20 vision can see at 40 feet.
These comparisons have several practical uses, says Divyesh Eye Hospital. For example, they are used to determine the cut-off for legal blindness, which is 20/200 in the United States. They are also used to determine eligibility and licensing requirements for certain occupations. To obtain a pilot's license, 20/20 vision is commonly required. One must have 20/40 vision to gain a driver’s license without the requirement of corrective lenses, and 20/80 may be used as a qualification for special education assistance.Learn more about Vision
A person with 20/15 vision can see an object from 20 feet away with the same acuity as a normal person would at 15 feet away. Technically, then, a person with 20/15 vision has better than perfect vision.Full Answer >
According to the Ohio Lions Eye Research Foundation, a person with 20/600 vision sees something at 20 feet away that a person with typical 20/20 vision sees at 600 feet. In another comparison, a person sees an object at 2 feet that someone with perfect eyesight notices at 60 feet.Full Answer >
According to How Stuff Works, 20/20 vision means that a person can see what a normal person can see when standing 20 feet away. A person with 20/13 vision is above average because it means he can see at 20 feet what a normal person can see at 13 feet.Full Answer >
Vision of 20/40 is worse than standard vision and sometimes requires glasses, depending on the exact nature of the vision problem, according to Eye Care Fun. Someone with vision of 20/40 can see objects from 20 feet away that someone with normal vision can see from 40 feet away.Full Answer >