A patient has come to the office for her first eye examination. The patient is diagnosed as having a visual acuity of 20/40. The patient asks the nurse what these numbers mean. What is a correct response by the nurse?
A) "A person whose vision is 20/40 can see an object from 40 feet away that a person with 20/20 vision can see from 20 feet away."
B) "A person whose vision is 20/40 can see an object from 20 feet away that a person with 20/20 vision can see from 40 feet away."
C) "A person whose vision is 20/40 can see an object from 40 inches away that a person with 20/20 vision can see from 20 inches away."
D) "A person whose vision is 20/40 can see an object from 20 inches away that a person with 20/20 vision can see from 40 inches away."
Ans: B
Feedback: The Snellen chart is a tool used to measure visual acuity. It is composed of a series of progressively smaller rows of letters and is used to test distance vision. The fraction 20/20 is considered the standard of normal vision. Most people can see the letters on the line designated as 20/20 from a distance of 20 feet. A person whose vision is 20/40 can see an object from 20 feet away that a person with 20/20 vision can see from 40 feet away. This makes options A, C, and D incorrect.
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