In this episode, we tackle the red-eye emergencies that hurt — literally. We explore the top causes of sudden, painful vision loss in one eye, from acute angle-closure glaucoma to optic neuritis, anterior uveitis, corneal ulcers, and scleritis. Learn how to identify key symptoms, interpret exam findings, and know when urgent action is critical. Perfect for residents, med students, and frontline clinicians facing eye pain in the real world.