There are several types of glaucoma, and all types of glaucoma can result in blindness if not diagnosed and treated in a timely manner, making it impossible to determine which type of glaucoma is the most serious. The main risk factor for glaucoma is pathologically increased intraocular pressure, characterized by optic nerve atrophy and visual field defects. It is the number one irreversible blinding eye disease worldwide. Different types of glaucoma may present with no obvious symptoms or with severe headache, eye pain, and severe loss of vision, with varying clinical manifestations. If diagnosis and treatment are not timely, they all lead to blindness. Glaucoma is generally categorized into primary, secondary and congenital, and primary glaucoma is further divided into acute closed-angle, chronic closed-angle and open-angle glaucoma. Secondary glaucoma includes post-traumatic glaucoma, glucocorticoid glaucoma and other neovascular glaucoma, etc. Congenital glaucoma is categorized into infantile, juvenile, and congenital glaucoma with other congenital abnormalities. Glaucoma patients are advised to seek timely hospital consultation to assess their condition and follow the doctor’s instructions for treatment.