What Health-Care Education Should Be Given to a Geriatric Patient

What health-care education should be given to a geriatric patient who is using a sulfacetamide solution for his left eye that was prescribed 2 months ago?

A) If the solution has turned a dark color,it has lost its potency and should be discarded.
B) It is not necessary to clean the left eye of debris prior to application.
C) If the left eye becomes transiently irritated immediately following application,the solution should be discontinued.
D) The solution should also be applied to the right eye for prophylaxis.