Medically, glaucoma is divided into three major categories based on the anatomical characteristics of the eye, the pathogenesis of the disease, and the age of onset: 1. Primary glaucoma: This includes two types (1) closed-angle glaucoma: This type of glaucoma is caused by the peripheral iris blocking the trabecular meshwork or having permanent adhesions to the trabecular meshwork. It occurs mostly in the elderly. Patients with acute attacks have red eyes, blurred vision, rainbow rings around the eyes when looking at lights, eye pain, headache, nausea, and vomiting. Patients with chronic glaucoma do not experience significant discomfort, and examination may reveal elevated intraocular pressure and closure of the atrial angle. (2) Open-angle glaucoma: The specific cause of this type of glaucoma is unknown, but it may be related to genetic factors, and is characterized by an atrial angle that is always open when the IOP rises. It often occurs in patients over the age of forty, with no significant discomfort. The range of vision they can see (visual field) narrows slowly before they finally experience vision loss and loss of visual function. Many patients do not notice the condition until it is very severe. 2. Congenital (developmental) glaucoma is caused by abnormal atrial fluid drainage in children born with atrial angle development during fetal development. The child may have photophobia, lacrimation, enlarged eyes, etc., or the eyes may be blue and stained. 3, secondary glaucoma Many diseases can interfere with and disrupt the atrial fluid circulation, causing secondary glaucoma. Common causes include: cataract, uveitis inflammation, eye trauma, diabetes, long-term use of glucocorticoids, central retinal vein obstruction, etc.