What is 20/20 Vision? - Page 6

Eye Chart -- Korean Alphabet -- 24 Letters

If you are fortunate enough to be able to identify the letters on this smallest (20/10) line, it means your distance visual acuity is twice as good as that of a person with "normal" vision. In other words, you can identify these very small letters from the standard testing distance of 20 feet, but a person with normal vision would have to be twice as close to the chart--only 10 feet away--to be able to correctly identify them.