Postoperative hypotony is a common complication of glaucoma filtering surgery, particularly with adjunctive use of antifibrotic agents. Associated structural sequelae and reduced visual function may occur in some eyes, resulting in the low-pressure syndrome. Precautions may be taken intraoperatively and postoperatively to decrease the likelihood of hypotony. Sometimes, despite these measures, the low-pressure syndrome still can occur, the management of which can be difficult. When simple observation does not result in spontaneous resolution, several noninvasive and invasive techniques are available, targeted at the cause of low IOP.