A paracentesis was made if it was required, and a viscoelastic agent used to form the anterior chamber. A 22-gauge needle was used to create needle tract into the anterior chamber. The tube was trimmed, and placed into the anterior chamber through the needle tract. The tube was attached to the sclera using a 10-0 Nylon suture if required. A sclera or corneal graft was placed over the tube and sutured to the sclera.