To Determine Whether Treatment Is Effective for a Patient with Primary

To determine whether treatment is effective for a patient with primary open-angle glaucoma (POAG) ,the nurse can evaluate the patient for improvement by

A) questioning the patient about blurred vision.
B) noting any changes in the patient's visual field.
C) asking the patient to rate the pain using a 0 to 10 scale.
D) assessing the patient's depth perception when climbing stairs.