What is 20/20 Vision? - Page 5

Eye Chart -- Chinese Characters

The "big E" on the top line of the traditional Snellen chart is the 20/200 line. If this is the smallest line on the chart you can correctly identify from a testing distance of 20 feet, your distance vision is very blurred. How blurry? A person with normal vision could stand 200 feet from the chart and still be able to identify the letter. Roughly speaking, that person with normal vision has distance visual acuity that is 10 times clearer than yours. Is it possible to have better-than-normal visual acuity? Yes! The traditional Snellen eye chart has three lines of letters below the 20/20 line that contain letters that are smaller than those on the 20/20 line. The letters on the bottom line are half the size of "20/20" letters.