Question

Snellen chart results 20/40 means, ________ eye sees an object at 20 ft away, when an__________ eye is able to see the same object at 40 ft away.

a) Left, uncorrected
b) Right, corrected
c) Left, corrected
d) Right, uncorrected

Answer 1

A Snellen chart result of 20/40 signifies that an eye sees at 20 feet what a normal eye sees at 40 feet, indicating vision that is half as good as normal.

Step-by-step explanation:

A Snellen chart result of 20/40 means that what a normal eye sees at 40 feet away, the tested eye sees at 20 feet away. This result suggests that the examined eye has a vision that is half as good as normal. It does not specify which eye (left or right) or whether the eye is corrected or uncorrected. Thus, the correct completion of the sentence would be: A Snellen chart result of 20/40 means, 'an eye sees an object at 20 ft away, when a normal eye is able to see the same object at 40 ft away'.