Glaucoma is an eye disease that causes damage to your optic nerve. It typically results from a build-up of fluid in the front part of the eye. The pressure caused by this extra fluid damages the optic nerve, leading to blindness.
There are two primary types of glaucoma: open-angle and angle-closure.
Open-angle glaucoma (a.k.a. wide-angle glaucoma) is the most common. With this type of glaucoma, your eye’s drainage system looks normal but the fluid doesn’t leave the eye as it’s designed to do.
Angle-closure glaucoma is more common in Asia than in Western countries. It is also sometimes called chronic angle-closure glaucoma or narrow-angle glaucoma. This type of glaucoma is marked by the drain space between your cornea and iris narrowing. This can cause your intraocular pressure to suddenly build up. Farsightedness and cataracts are also associated with this type of glaucoma.