Glaucoma, mainly caused by elevated intraocular pressure causes the optic nerve of the affected eye to be unable to withstand the ultra-high pressure, resulting in damage and atrophy of the optic nerve, which in turn causes visual impairment and visual field defects. Glaucoma is the number one non-recoverable blinding eye disease in China and around the world. Glaucoma is responsible for about 10-15% of blindness in China and abroad, so when people hear about glaucoma, they are always afraid of it, as if they have seen the invisible killer of their eyes. Glaucoma can be divided into two categories, primary glaucoma and secondary glaucoma, according to its etiology. Patients with primary glaucoma generally have anatomical factors, such as small eyeballs, short eye axis, hyperopia, and shallow anterior chamber. Glaucoma may be triggered by mood swings, staying too long in dimly lit areas, and prolonged head-down reading. In severe cases, it can lead to an acute grand mal attack, which can result in permanent blindness if not treated promptly. The best way to reduce the visual impairment that glaucoma may cause is to detect and treat it early. Glaucoma is hereditary, and people with a family history of the disease, diabetes, elderly people with cataracts at an advanced age, and in addition, especially people with high myopia, are among the high-risk groups. The most important thing in early detection is self-awareness and regular checkups. The prodromal phase of closed-angle glaucoma is mild, with mild eye pain, decreased visual acuity, iris and mild ipsilateral migraine, nasal and orbital pain and nausea, mild eye redness, and fogging of the black eye (cornea). It is often triggered by fatigue or anger and can be relieved by sleep or by going to a bright place. When you have similar symptoms, you must be alert to the possibility of glaucoma and go to a regular hospital ophthalmology clinic in time. Once the diagnosis of glaucoma is confirmed, treatment should be carried out. Glaucoma can be treated with medication, laser treatment and surgery. Usually, medication can only relieve the symptoms, but closed-angle glaucoma will eventually require laser or surgical treatment. Patients with early glaucoma can be treated with YAG laser iris perforation, which can be done on an outpatient basis. If a patient’s IOP cannot be controlled medically and atrial angle function is reduced by half, then inpatient surgical treatment is required. In either case, it is important that treatment be performed as early as possible, as the final outcome of treatment depends on the visual acuity at the time of treatment. In layman’s terms, the best treatment for glaucoma is to maintain the existing vision, that is, if the treatment is done with good vision, then the vision can be maintained at a good level, and if it is already advanced glaucoma treatment can be maintained at a poor level. The ultimate goal of glaucoma treatment is to reduce intraocular pressure, protect visual function, and delay or prevent continued damage to visual function, especially visual field. If a patient with glaucoma has his IOP controlled at a so-called “normal level”, the so-called “normal level” IOP value is still not necessarily ideal. Only when the visual function does not continue to deteriorate and the visual field is stable and does not shrink is the “safe IOP” pursued by various treatments. Therefore, glaucoma is a lifelong disease, even after laser or surgical treatment, you still need to visit the hospital regularly to review your vision, IOP, and even your visual field.