There are two main causes of elevated intraocular pressure: first, the atrial fluid flow pathway is restricted, and obstruction or narrowing of the flow pathway can cause poor flow of atrial fluid, and poor flow can cause a continuous increase in intraocular pressure. Secondly, there is an obstruction of the trabecular network, which causes a decrease in the filtration of atrial fluid. The decrease in filtration ability is not caused by obstruction of the flow channel, but by a decrease in the ability to regulate itself. Both of these conditions cause atrial fluid to accumulate in the eye to the extent that it raises intraocular pressure, the former being called closed-angle glaucoma and the latter open-angle glaucoma. In general, the treatment of closed-angle glaucoma is based on re-establishing the flow of atrial fluid, such as laser, filtration surgery or placement of a drainage valve. For open-angle glaucoma, the main treatment principle is to improve the filtration ability, mainly with drugs, first with a single class of drugs to improve the filtration ability, if a single drug does not work, you can combine two drugs or three drugs for treatment.