Since Molteno's original design, several drainage devices have become commercially available for implantation. Currently, the two most commonly used devices are the Ahmed Glaucoma Valve (AGV) (New World Medical, Inc., Rancho Cucamonga, CA), and the Baerveldt Glaucoma Device (BGD) (Advanced Medical Optics, Santa Ana, CA). The AGV, with a venture-based flow-restrictive valve is helpful in minimizing postoperative hypotony and complications associated with hypotony, including flat anterior chamber, choroidal effusions, and suprachoroidal hemorrhage. However, there appears to be a high rate of encapsulation and hypertension associated with this device, and increased requirement of postoperative glaucoma medication use. The BGD, a non-valved device, requires early ligature of flow by the use of a suture restriction to allow adequate time for bleb formation. Although this can result in an initial post-operative hypertension phase, it results in less encapsulation and theoretically fewer postoperative glaucoma medications and better IOP control. However, the lack of a flow-restrictor and the large filtering surface area may result in a greater risk for hypotony related complications.