Glaucoma can be divided into open-angle and closed-angle types according to whether the atrial angle (i.e., the drain) is closed or open; chronic and acute according to the speed and intensity of onset. Chronic glaucoma is a gradual weakening of the eye’s visual function. When the eye pressure rises, it first damages the weakest visual cells in the eye and then breaks the ring step by step, causing the patient’s eye to become increasingly narrow and finally blind. Patients with chronic glaucoma do not easily notice the symptoms, and it is too late to come to the doctor until visual function is affected. Patients with acute glaucoma may experience sudden headaches and eye swelling, but they are easily confused with other conditions. In particular, middle-aged and elderly patients with headaches accompanied by a sharp loss of vision or other eye symptoms should not ignore the possibility of an acute attack of closed-angle glaucoma. Wrong choice of treatment and medication can lead to further deterioration of the condition and increase the importance of functional impairment. In addition, most patients with closed-angle glaucoma have early headaches, rainbow vision (i.e., rainbow when looking at lights), and foggy vision, which usually appear at night and are relieved after rest. Prompt consultation once detected can prevent the occurrence of acute attacks or chronic optic nerve damage.