What Is the Most Important Assessment Question for the Nurse

What is the most important assessment question for the nurse to ask a patient who is newly prescribed apraclonidine (Iopidine) for glaucoma?

A) "How long have you had glaucoma?"
B) "What other medications are you currently taking?"
C) "Have you had any difficulty with retaining urine?"
D) "Do you have asthma or any chronic respiratory problem?"