---
title: What is aqueous shunt implantation?
description: "Aqueous shunt implantation places a tube and plate device (glaucoma drainage implant) to divert aqueous humour from inside the eye to a reservoir under the conjunctiva. It is used for complex or refractory glaucoma. ## How Shunts Work The tube…"
url: "https://bluefinvision.com/knowledge-base/topics/treatments-procedures/what-is-aqueous-shunt-implantation/"
updated: "2025-12-12"
category: "Treatments & Procedures"
---

# What is aqueous shunt implantation?

Aqueous shunt implantation places a tube and plate device (glaucoma drainage implant) to divert aqueous humour from inside the eye to a reservoir under the conjunctiva. It is used for complex or refractory glaucoma.

## How Shunts Work

The tube is inserted into the anterior chamber or ciliary sulcus, while the plate sits on the sclera under the conjunctiva where a bleb forms. Fluid drains along the tube and diffuses through the surrounding tissues, lowering intraocular pressure.

- Common devices include various valved and non‑valved implants
- Often chosen when trabeculectomy is unlikely to succeed or has failed
- Can be used in eyes with scarring, neovascular glaucoma, or previous surgery
- Post-operative pressure may initially be high or low depending on implant type and ligatures

## Long-Term Care

Shunts can control pressure for many years but require lifelong monitoring. Complications include tube blockage, erosion, diplopia, or late failure.

- Topical drops may still be needed to fine-tune pressure
- Patients must attend regular follow-up to check tube position and bleb health
- Prompt attention is needed for redness, pain, or vision change near the implant
- Despite risks, aqueous shunts are invaluable for salvaging pressure control in challenging glaucoma