Closed-angle glaucoma is one of the two main types of glaucoma. Glaucoma is an eye disease in which the optic nerve is damaged. Usually, high pressure inside the eye causes the damage.
Eye pressure builds up when fluid that normally flows out of the eye becomes blocked.
The pressure in the eye increases. Without treatment, the high pressure can damage the optic nerve and cause blindness. This type of glaucoma usually happens in one eye at a time. Also, the angle can become blocked in older people when the iris bulges forward until it touches the cornea and blocks the drainage channel. Closed-angle glaucoma is often a medical emergency, so diagnosis is often based on your symptoms and medical history.