Final answer:
To reduce the risk of falls in a patient with homonymous hemianopsia after a stroke, the nurse should instruct the patient to turn their head from side to side to scan the environment.
Step-by-step explanation:
The student's question is about caring for a client with homonymous hemianopsia following a stroke. This condition causes a loss of vision in the same half of the visual field of each eye. To reduce the risk of falls while ambulating, the nurse should instruct the client to scan the environment by turning the head from side to side. This compensatory strategy helps the client to better detect obstacles or dangers in the environment, therefore reducing the risk of falls.