Final answer:
The nurse instructs the nursing assistant to face the client and speak clearly at a normal pace when communicating with a hearing-impaired client.
Step-by-step explanation:
The nurse instructs the nursing assistant to face the client and speak clearly at a normal pace when communicating with a hearing-impaired client. Speaking loudly and using exaggerated lip movements may not be helpful as it can distort speech and make it difficult for the client to understand. Using complex gestures can also be confusing for the client. Standing with a light source behind may cast shadows on the nurse's face, making it harder for the client to see their lip movements. Therefore, the most effective measure is to face the client and speak clearly at a normal pace.