Visual acuity
Normal values:
Visual acuity is expressed as a fraction. The top number refers to the distance you stand from the chart. This is usually 20 feet. The bottom number indicates the distance at which a person with normal eyesight could read the line with the smallest letters that you could correctly read. 20/20 is considered normal. 20/40 indicates that the line you correctly read at 20 feet could be read by a person with normal vision at 40 feet.
What abnormal results mean:
Abnormal results may indicate that you need corrective lenses to obtain normal vision.
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