Which of the following is correct regarding the Snellen Chart?

The Snellen Chart is a tool used to measure visual acuity, and understanding its components is essential for assessing a person's eyesight. The correct response encompasses several key aspects:

The top number on the Snellen Chart indeed represents the testing distance, typically measured in feet. This distance is standard in the United States, where vision is assessed at 20 feet.

The bottom number signifies the smallest letter size that can be read by the individual being tested at that distance. For example, if the bottom number is 40, this indicates that the person can see at 20 feet what a person with normal vision can see from 40 feet.

Additionally, a person with normal vision, defined as having a visual acuity of 20/20, should be able to clearly identify the letters or symbols on the chart designated for the "20" line, which is standardized to represent average visual performance.

Recognizing that each of these statements is correct is crucial for understanding how visual acuity is evaluated. Therefore, the collective statement that encompasses all these points appropriately reflects the function of the Snellen Chart.