Step 1 : Introduction to the question "What unit of measurement does the 20 in 20/20 vision refer to?"
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 · A person with 20/20 vision can see what an average individual can see on an eye chart when they are standing 20 feet away. An eye chart measures visual acuity,
Step 2 : Answer to the question "What unit of measurement does the 20 in 20/20 vision refer to?"
Feet:
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. If you have 20/100 vision, it means that you must be as close as 20 feet to see what a person with normal vision can see at 100 feet. Having 20/20 vision does not necessarily mean you have perfect vision. 20/20 vision only indicates the sharpness or clarity of vision at a distance.
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