Fig. 19. Glaucoma drainage implant devices. From left to right: Ahmed glaucoma valve (New World Medical, Inc., Rancho Cucamonga, CA); 200-mm2 Baerveldt implant (Iovision, Irvine, CA); Krupin eye disk (Hood Laboratories, Pembroke, MA); Molteno implant (IOP, Inc., Costa Mesa, CA); and OptiMed pressure regulator (OptiMed, Inc., Santa Barbara, CA). (Reprinted with permission from Prata JA, Mérmoud A, LaBree L, Minckler DS: In vitro and in vivo flow characteristics of glaucoma drainage implants. Ophthalmology 102:894, 1995; Courtesy of Ophthalmology)