Final answer:
The most appropriate nursing diagnosis for a client with homonymous hemianopsia following a stroke is Impaired Visual Perception. It involves the loss of half of the field of view on the same side in both eyes.
Step-by-step explanation:
The nurse is caring for a client who has homonymous hemianopsia following an acute stroke. The most appropriate nursing diagnosis for this client would likely be Impaired Visual Perception related to the neurological damage caused by the stroke. This specific type of visual impairment means that the client has lost half of the field of view on the same side in both eyes. As such, interventions would focus on ensuring safety, compensatory strategies to adjust to the visual field deficit, and possibly working with a rehabilitation specialist to maximize the client's independence and facilitate adaptation to the changes in vision.