Angle-closure glaucoma (ACG) is a condition that leads to optic nerve neurodegeneration caused by increased intraocular pressure (IOP). It’s an ophthalmic emergency that may cause irreversible visual impairment if left untreated. ACG causes can be classified into Primary and Secondary causes. This article will focus on Primary Angle Closure Glaucoma (PACG). In this article, we will briefly outline the pathophysiology, diagnosis, and management of acute PACG.