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20/20 means you can read at 20 feet what a typical person reads at 20 feet. It's a good result, but it only measures one thing. Here's what the numbers mean and what they leave out.
20/20 means you can read at 20 feet what a typical person reads at 20 feet. It's a good result, but it only measures one thing. Here's what the numbers mean and what they leave out.