Patients experience blurry vision when it starts to get dark or after an emotional upset. They see halos around lights and may get headaches around the eye or on the brow accompanied by blurry vision and halos. Nausea may accompany the above symptoms. These symptoms are often mistaken for a migraine headache or another non-glaucoma related vision problem. They can also be precipitated by certain medications a patient is taking. Some ingredients in many over-the-counter cold-relief medications and prescription medications for various conditions can make a susceptible patient more likely to suffer acute angle closure glaucoma. Patients with these symptoms need a careful evaluation of the drainage angle of their eyes to determine if they are at risk for angle closure glaucoma.