Angle-closure glaucoma, also known as closed-angle glaucoma or narrow-angle glaucoma, is a debilitating eye condition that occurs when the fluid pressure within the eye increases due to blockage of the drainage system. This condition can contribute to vision loss and can be incredibly painful. In addition to the aforementioned synonyms, this condition is also sometimes referred to as acute angle-closure glaucoma or narrow-angle-closure glaucoma. It is important to note that, whatever name it goes by, angle-closure glaucoma is a serious issue that requires prompt medical attention. Those who experience symptoms such as sudden eye pain, blurry vision, or halos around lights should seek medical attention immediately.