Many patients ask this question during their visits: What are the symptoms of having glaucoma? I would like to talk about it in detail here in the hope that I can give some help to those who have this question. There are many types of glaucoma, and the symptoms are different for different types. Acute glaucoma: Glaucoma with an acute increase in intraocular pressure, including acute closed-angle glaucoma. In a mild attack, the eyes are slightly uncomfortable and lightly distended, and may be accompanied by orbital acidity, ipsilateral head discomfort, slightly blurred vision, and rainbow circles when looking at lights, which can be relieved by rest and napping. In grand mal seizures, i.e., the above symptoms are not relieved after rest, the symptoms gradually worsen, the eye swelling becomes more and more obvious, the headache worsens, and some people are accompanied by nausea or even vomiting. Some patients consult internal medicine for unknown reasons. At this time, vision loss is often obvious, and the worst can be reduced to several fingers and manual vision. Some secondary glaucoma, such as neovascular glaucoma, will also have symptoms such as the pain mentioned above due to high intraocular pressure, plus some symptoms of the primary disease. Chronic glaucoma: This includes chronic closed-angle and open-angle glaucoma. Some patients have no symptoms in the early stage. Some patients have mild distension and pain, which is not easily distinguished from visual fatigue, etc. It is only in the middle and late stages of the disease that darkening of the periphery of the visual field (smaller visual field) is noticed. Vision is poor at night or in low light, unlike normal people who can adapt slowly.