Glaucoma Drainage Implants

**Definition:** Devices, usually incorporating unidirectional valves, which are surgically inserted in the sclera to maintain normal intraocular pressure.

**Tree numbers:** - E07.695.250

**Synonyms:** - Aqueous Humor Shunt - Aqueous Humor Shunts - Aqueous Shunt - Aqueous Shunts - Glaucoma Drainage Implant - Glaucoma Filtration Implant - Glaucoma Filtration Implants