Review Question - QID 108827

A 65-year-old patient with a history of COPD and open-angle glaucoma in the left eye has had uncontrolled intraocular pressure (IOP) for the last few months. She is currently using latanoprost eye drops. Her ophthalmologist adds another eye drop to her regimen to further decrease her IOP. A week later, the patient returns because of persistent dim vision. On exam, she has a small fixed pupil in her left eye as well as a visual acuity of 20/40 in her left eye compared to 20/20 in her right eye. Which of the following is the mechanism of action of the medication most likely prescribed in this case?