Ahmed glaucoma valve implantation in a case of volatile intraocular pressure and preoperative hypotony

When the outflow pathways are compromised, any fluctuation in the inflow has a much more dramatic effect on the IOP. In such instances, IOP lowering agents have a very narrow therapeutic window and lead to volatility in IOP. This case demonstrates the potential for tube shunt surgery to reduce the lability of IOP in a patient with volatile IOP control.