http://20th.cpcnews.cn/english/index.html WebJul 30, 2024 · The 20/20 measurement system was developed by the Dutch ophthalmologist Herman Snellen in 1862. The fraction 20/20, along with other fractions of visual acuity, such as 20/40 and 20/60, are known as the Snellen fractions. If you have 20/20 vision, you can see objects clearly at 20 feet that should be seen clearly at this same distance.

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