Acute closed-angle glaucoma, mostly seen in elderly people over 50 years old, is often caused by acute major glaucoma attacks after emotional excitement and overexertion. In addition to ocular symptoms, it is often accompanied by systemic manifestations such as nausea, vomiting and headache. Patients may ignore the ocular symptoms and often consult gastroenterology or neurology, thus delaying treatment. Note: Although glaucoma is an irreversible and blinding eye disease, the condition can be effectively controlled if it is detected and treated early. Therefore, it is important to know some general knowledge about glaucoma so that you can raise your awareness of prevention in your daily life. When you encounter headache and nausea, if it is accompanied by eye manifestations such as eye redness, photophobia, eye pain and blurred vision, you must be alert! While consulting internal medicine, visit the ophthalmology department as early as possible to rule out glaucoma. The common ocular manifestations of acute closed-angle glaucoma: 1, before the attack there are often mental and emotional triggers or had excessive eye use in dark places; 2, rainbow vision” (i.e., when looking at lights, there is a rainbow-like halo); 3, a sharp decline in vision, severe cases only the immediate index, or even only light perception; 3, sudden severe eye distension and pain, reflex headache, malignant, vomiting and other symptoms. A few patients may have diarrhea; 4, eye pressure increases, even “hard as stone”; 5, eye redness (i.e., conjunctival congestion), corneal edema and cloudiness, pupil dilatation. What should I do if I have acute angle-closure glaucoma? Acute closed-angle glaucoma can cause irreversible damage to visual function and blindness within a short period of time if the acute attack is not treated promptly and effectively. It is an ophthalmic emergency that requires emergency care during an acute attack. However, not all patients with acute angle-closure glaucoma will have the above-mentioned symptoms. Sometimes mild ocular and systemic symptoms may occur under certain triggers, such as mild eye pain, eye distention, blurred vision with mild headache and nausea, etc. These symptoms may resolve on their own after rest or when the triggers are removed (from dark to strong light). Repeated occurrence of the above symptoms may also cause a gradual decline in visual function. Therefore, do not be careless when the above-mentioned symptoms occur, and make sure to go to the hospital for a checkup in time, especially do not miss the eye examination, so as not to delay the treatment leading to vision loss or even blindness.