Mr. C's visual acuity is 20/50 . This means that he:
a. can see 50% of what the average person sees at 20 feet.
b. has perfect vision when tested at 50 feet.
c. can see 20% of the letters on the chart's 20/50 line.
d. can read letters while standing 20 feet from the chart that the average person could read at 50 feet.
D
Visual acuity is measured as a fraction, in which the top number is the distance that the patient is standing from the chart; the bottom number is the distance that an average person can stand and still read the line.
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