In this video, Mark aka MFA, goes over the definition of 20/20 vision as well as going through some examples on different types of vision based on using the widely used Snellen Chart. The Snellen Chart was created by the Dutch ophthalmologist Herman Snellen in 1862 and has been used worldwide since.
Basically having 20/20 vision means that at 20 feet, you can see as well as a nominal, or predefined normal person's vision at 20 feet. Where normal vision is defined as being able to see 2 lines separated by 1.75mm apart from 20 feet. A person with 20/30 vision means that you can see from 20 feet the same as a normal person from 20 feet.
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