The majority of complications occur shortly after surgery. These are generally related to high pressure (due to inflammation following surgery) or low pressure (too much aqueous flow through the tube). Periods of low pressure which are more associated with non-valved shunts, can cause retinal detachments, hypotony maculopathy or haemorrhages. Periods of high pressures, which are more associated with<unk> d shunts, are detrimental to the optic nerve. Long term complications of this surgery include diplopia and corneal oedema. There are also device related complications, which will require surgical revision. For example, erosion, where the conjunctiva erodes over the shunt leaving it exposed, the condition of which may be revised or prevented in advance by the use of amniotic membrane, The ologen collagen matrix facilitates tissue regeneration and its application over the site of device implantation can strengthen tissue recovery, reducing possibility of erosion. When the device malfunctions it may need to be replaced. Possible scenarios include blockage, where a particle becomes logged in the tube line blocking flow; retraction, where the tube line slips out of correct position such that flow is inhibited or halted;<unk>  failure, where the<unk>  stops working blocking flow completely. Surgical failure occurs due to the ongoing scarring over the conjunctival dissipation segment of the shunt may become too thick for the aqueous humor to filter through. This may require preventive measures using anti-fibrotic medication like 5-fluorouracil (5FU) or Mitomycin-C (during the procedure), or creating a necessity for revision surgery with the sole or combinative use of biodegradable spacer or collagen matrix implant. A Cochrane Review comparing aqueous shunt surgery with and without Mitomycin-C did not find benefit or harm associated with the intervention.
Glaucoma valve
Intrastromal corneal ring segment
Christmas eye
Ghost cell glaucoma
Intraocular lens
Surfer's ear
Instrument myopia
Meesmann corneal dystrophy