Answer :
Final answer:
A visual acuity of 6/20 does not correspond to any of the choices given (A. 20/20, B. 20/30, C. 20/40, D. 20/50), with each of those indicating better visual acuity.
Explanation:
Visual acuity is expressed using a standard measure where the first number represents the test distance between the subject and the chart (usually 20 feet), and the second number indicates the distance at which a person with normal vision can read the same line of the chart.
In the case of visual acuity of 6/20, the equivalent in the more commonly used fraction in the United States would be 20/60. This means that what a person with 6/20 acuity can see at 6 meters, a person with normal vision could see at 20 meters, or equivalently, what they can see at 20 feet, a person with normal vision could see from 60 feet away.
None of the options, A. 20/20, B. 20/30, C. 20/40, or D. 20/50, correspond to visual acuity of 6/20 since each of these indicate better visual acuity than 6/20.
