DD glaucoma is a disease that causes damage to the optic nerve. The optic nerve is made up of many nerve fibers, and when intraocular pressure increases, it can cause damage to the nerve fibers, resulting in visual field defects. Early mild visual field defects are usually difficult to detect, but severe damage to the optic nerve can lead to blindness. Glaucoma classification: 1. Chronic simple glaucoma (open-angle glaucoma): the most common type of glaucoma. As age increases, the incidence of chronic simple glaucoma increases. Although the atrial angle is open in patients with chronic simple glaucoma, it cannot effectively drain the atrial fluid, causing a gradual increase in intraocular pressure and damaging the optic nerve. In some patients, although their intraocular pressure is within the normal range, their eyes are less tolerant and normal intraocular pressure can also cause glaucomatous optic nerve damage. The vision changes caused by chronic simple glaucoma are slow and painless, so by the time most patients realize they may have the disease, it has actually progressed to a certain stage. 2. Closed-angle glaucoma: Sometimes the atrial angle may be completely blocked, causing an acute attack of closed-angle glaucoma when the intraocular pressure rises sharply. Can glaucoma be cured? Generally speaking, glaucoma cannot be cured, but it can be controlled. Once diagnosed, it requires frequent, lifelong care nonstop observation and treatment to control the eye in order to protect the optic nerve and prevent vision damage. Eye drops, oral medications, laser surgery and microsurgery have been quite successful in controlling eye pressure over the long term. Many people believe that glaucoma is cured when medications or surgery bring high intraocular pressure under control to a safe level. In fact, glaucoma is only controlled; it is not yet cured. Even after medication or surgery has successfully controlled IOP, routine checkups with an ophthalmologist are necessary.