A nurse is instructing a newly licensed nurse about age-related changes to vision in older adult patients. Which of the following should the nurse include as an example of an expected age-related change?

The correct answer is B: Decreased depth perception. As individuals age, changes in the eyes, such as reduced pupil size and decreased ability to focus, can lead to a decline in depth perception. This affects the ability to accurately judge distances. Increased flexibility of the lens (choice A) and increased tone of eye muscles (choice C) are not typical age-related changes and can actually be signs of pathology. Reduced thickness of the natural lens (choice D) is not a common age-related change either.