20/20 is essentially a comparison between you and someone with “normal vision”. The first 20 is you, standing 20 feet away looking at a very small object. That doesn’t change, always stays the same.
Author: Chan Optometry |
20/20 is essentially a comparison between you and someone with “normal vision”. The first 20 is you, standing 20 feet away looking at a very small object. That doesn’t change, always stays the same.
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