Snellen Eye Chart

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SNELLEN EYE CHART
Using a Snellen eye chart
: The chart is usually read while standing at a distance of 20 feet. Acuity
is represented as a fraction, with the distance at which you are standing being the numerator (top part of
fraction), and the normal maximum legible viewing distance ("Distance" on the chart above) as the
denominator (bottom of fraction). So if, at 20 feet, you can read the letters on the row marked "40", this
means you have visual acuity of 20/40 or better: 1/2 normal. From 10 feet, if the smallest letters you could
read were on the "40" line, this would give you an acuity of 10/40: 1/4 normal. If you are nearsighted, your
vision will become more normal the closer you stand to the chart. Source:

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