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If your visual acuity is determined to be 20/20, you see at 20 feet what a person with normal vision sees at 20 feet. If you have 20/40 vision, you see at 20 feet what a person with 20/20 vision would see at 40 feet. And, if you're one of the lucky ones (e.g., 20/15), you can see at 20 feet what others would have to move closer (15 feet) to see. Your visual acuity is an important measure of your vision. Many common problems can be identified by this measurement method, including the ones you've most likely heard of before - like nearsightedness and farsightedness.
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