Several residents of a long-term care facility are receiving eye drops to treat glaucoma. The practical nurse (PN) should caution the unlicensed assistive personnel (UAPS) caring for these clients to observe for which effect because it places the clients at risk for falls?

A. Conjunctival redness: Redness of the eyes is a local effect of eye drops and does not significantly affect vision or balance, so it does not increase fall risk. B. Elevated blood pressure: While systemic absorption of some glaucoma medications can affect blood pressure, this is less common and less directly linked to immediate fall risk than visual changes. C. Pupillary constriction: Miotic eye drops used for glaucoma cause pupillary constriction, which can impair night vision and depth perception. This visual disturbance increases the risk of falls, making it important for staff to monitor clients closely. D. Increased heart rate: Certain glaucoma medications may affect heart rate, but this is typically mild. Visual changes, rather than cardiovascular effects, pose the greatest immediate fall risk.