passages.id: PMC-2792620-sec-33__text
passages.type: sec
passages.text: Surgery
  Trabeculectomy should be considered in all patients, when the 'target IOP' is not achieved with glaucoma medications and if the expected rate of visual loss could affect the patient during their lifetime. In this procedure, an opening is made in the trabecular meshwork, so that aqueous humor can drain into the sclera.
  Many patients can discontinue glaucoma medications after surgery. Approximately one-third of the trabeculectomy patients develop cataract within five years. If trabeculectomy fails, another type of surgery places a drainage tube (Molteno tube) in the eye, between the cornea and iris, which exits at the junction of the cornea and sclera. Cyclodestructive procedures, which lower IOP by destroying the ciliary body, are typically reserved for eyes, which are refractory to all other forms of therapy. These procedures include cyclocryotherapy, cylcodiathermy and laser cyclophotocoagulation.[91-93]
  