Final answer:
The home health nurse should assess the client for visual disturbances caused by ethambutol.
Step-by-step explanation:
The home health nurse should assess the client at each home visit for visual disturbances as an adverse effect of taking ethambutol (Myambutol). Ethambutol can cause optic neuritis, which can lead to blurred vision, difficulty in distinguishing colors, and changes in visual acuity.