The patient has confirmed glaucoma and bilateral Ahmed drainage valves in situ.

Glaucoma drainage devices divert aqueous humor from the anterior chamber to a regional external reservoir and thereby control intraocular pressure.

There are two types of devices depending if the device has an intraocular pressure regulating valve or not.

Nonvalved devices include the Molteno, Baerveldt, Shocket, and the Eagle vision implant.

The most commonly used valved implant is the Ahmed glaucoma valve (AGV).

The devices are usually placed in the superotemporal quadrant due to ease of surgical access and to reduce the risk of motility disturbances.

The devices are placed in the inferior quadrants only if there is silicone oil in the globes.

Disclosure: I, Ashesh Ishwarlal Ranchod, have no actual or potential ethical or financial conflict of interest in relation to the devices. This case is not intended to be a personal endorsement or recommendation of this product.