A nurse is performing a complete physical examination on a patient. After examining the patient with the Snellen chart, the nurse documented distance vision in both eyes 20/40. The patient asks the nurse what 20/40 means:

A) 20 represents the distance a normal eye can read and 40 represents the distance your eye read the chart: This option incorrectly reverses the interpretation of the numbers. The correct interpretation is that the first number represents the distance at which the patient is reading the chart, and the second number represents the distance at which a person with normal vision would be able to read the same line. B) 20 represents the distance you are placed from the chart and 40 represents the distance a normal eye read the chart: This is the correct interpretation of visual acuity. In the Snellen chart system, the first number (20) represents the distance (in feet) from which the patient is viewing the chart, while the second number (40) represents the distance at which a person with normal vision (20/20) would be able to read the same line of the chart. C) 20 represents the distance you are placed from the chart and 40 represents the distance your eye read the chart: This option is incorrect because it does not accurately describe what the numbers mean. The second number represents the distance at which normal vision can read the line, not the distance the patient’s eye read the chart. D) 40 represents the distance you are placed from the chart and 20 represents the distance normal eye read the chart: This option incorrectly assigns the numbers. The distance of 20 feet is standard for testing vision, and 40 feet is the benchmark for normal vision. The correct understanding is that 20 is the test distance, and 40 is the comparison distance for normal vision.