![]() In countries that use the metric system of measurements, the Snellen chart is placed six meters away, so visual acuity is measured 6/6. For example, someone with 20/30 vision sees letters on the Snellen chart at 20 feet that someone with good visual acuity would see at 30 feet. People who have slight refractive errors, or problems like nearsightedness or farsightedness, may see the Snellen chart differently. The measurement of 20/20 vision in the United States means that you can see letters on the Snellen eye chart clearly from 20 feet away. Most people believe that 20/20 vision, which is a measurement of visual acuity or clarity of vision at a distance, is “perfect.” However, this measurement is only one of several ways to understand good or great vision and one way for optometrists and ophthalmologists to diagnose and treat vision problems. What Is 20/20 Vision? Is It Perfect Eyesight? Research from the National Institute of Health shows that about 35 percent of American adults have 20/20 vision without the aid of vision correction. There are two main ways that you can achieve this: through LASIK surgery and through corrective lenses. Although 20/20 is the standard by which we measure good eyesight, it’s possible to improve acuity to be stronger than 20/20.
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