By contrast, acute closed-angle glaucoma is very different. Symptoms of acute closed-angle glaucoma are evident and may come on suddenly. Acute closed-angle glaucoma usually appears as a red, painful eye. Facial pain, headache, blurry vision, rainbow-colored haloes around lights, nausea and vomiting may also be signs of closed-angle glaucoma. When the symptoms begin, it is usually referred to as an "attack" of acute angle closure and is considered a medical eye emergency.