Step 1 : Introduction to the question "What unit of measurement does the 20 in 20/20 vision refer to?"
20/20 vision is a widely recognized term used to express normal visual acuity (the clarity or sharpness of vision) when observing objects from a distance of 20 feet. Having 20/20 vision signifies that an individual can see objects with the same clarity as an average adult when standing 20 feet away from the item. Visual acuity is typically measured on a standard Snellen chart, which displays letters that become progressively smaller as you move down the chart. It is important to note that 20/20 vision refers to having “normal” vision, not “perfect” vision.
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 widely recognized term used to express normal visual acuity (the clarity or sharpness of vision) when observing objects from a distance of 20 feet. Having 20/20 vision signifies that an individual can see objects with the same clarity as an average adult when standing 20 feet away from the item. Visual acuity is typically measured on a standard Snellen chart, which displays letters that become progressively smaller as you move down the chart. It is important to note that 20/20 vision refers to having “normal” vision, not “perfect” vision.
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