WebMD says that a person has visual impairment if they can only see 20/50. People with 20/50 vision can see something clearly from 20 feet away that people with normal vision can see clearly from 50 feet away.
All About Vision says that people whose vision is 20/20 are considered to have normal vision. In the United States, a person needs to be able to see at least 20/40 or better to get a driver’s licence. This could mean wearing glasses or contacts. With glasses or contacts, a person is considered legally blind if they can’t see better than 20/200. A visual acuity of 20/10 or better means you have good eyesight, but not many people have it.
All About Vision says that eye charts are used by doctors to measure how well a person can see. The Snellen eye chart is a common one that shows 11 rows of capital letters. As you move toward the bottom of the chart, each row of letters gets smaller. The smallest line of letters that a person can read is used to measure their visual acuity. The “tumbling E” eye chart is a different one that is often used for young children or people who can’t read or recognise letters.
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