What is 2020 vision? (It's not what you think) 

An in depth look at what it means to have 20/20 vision.
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Textbook definition of 20/20 vision:
The ability to distinguish an image that subtends 5 minutes of arc at a 20 foot distance.
The numerator of 20/20 defines the testing distance of the person being tested and the denominator defines the testing distance that a person with “20/20” vision would have to stand in order to see the same sized letters.
Definition of legal blindness in the US:
If someone has 20/200 vision or less in the better seeing eye (with a corrective lens) or has less than 20 degrees of visual field, then they are considered legally blind.
Question of the Day: When was your last eye exam? How good are your eyes? Can you see 20/20? Let me know in the comments!
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About this video: When was the last time you checked your visual acuity or had an eyesight test? At your last eye exam, an optometrist or another eye care professional likely completed an eye test where they measured your visual acuity by completing the snellen test or reading the snellen chart. If you were fortunate enough, your vision corrected to at least the 20/20 line. But what is 20/20 vision? What does 20/20 vision mean? Check out this video to find out.