The main cause of closed-angle glaucoma is pupillary blockage, which in turn causes atrial angle closure and adhesions, resulting in increased intraocular pressure and eventually damage to the visual field and optic nerve, leading to blindness. The YAG laser utilizes the ionizing effect of the laser, which causes a small explosion in the iris within a very short period of time, resulting in a powerful shock wave. The small explosion and mechanical shock wave strike the surrounding iris tissue to form a small penetrating hole, opening up a new channel for atrial water circulation, allowing the anterior and posterior chambers to communicate and the atrial water to circulate effectively, thus preventing acute attacks in patients with primary atrial angle closure. YAG laser peripheral iridotomy can be performed on an outpatient basis with some hypotensive effect and good postoperative recovery.