“…1,7 In selective cases, the insertion of the drainage tube into the anterior chamber is contraindicated because of a shallow anterior chamber, [8][9][10] vitreous prolapse, pseudophakia/ aphakia, 11 complicated glaucoma with corneal disease and angle neovascularization, [12][13][14] anterior chamber pathology such as peripheral synechiae secondary to inflammation, corneal disease, previous corneal surgeries (penetrating keratoplasty or kerato prosthesis), 15,16 and failed prior trabeculectomies. 3,7,[17][18][19] In such cases, the glaucoma tube shunt can be inserted through the pars plana with simultaneous pars plana vitrectomy (PPV). A PPV may also be indicated to address vitreous prolapse into the anterior chamber when the tube is positioned in the anterior chamber.…”