ENCYCLOPEDIA DETAIL

DISEASE

Visual Acuity

Visual acuity is usually measured with a Snellen eye chart. The standard for “normal” vision is 20/20. This means that the person being tested sees the same line of letters on the chart at 20 feet that the person with normal vision sees at 20 feet.
A visual acuity of 20/70 means that the person being tested sees at 20 feet what a person with normal vision can see at 70 feet.
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