Gonioscopy-assisted transluminal trabeculotomy GATT is a minimally invasive glaucoma surgery that opens the eye’s drainage canal 360 degrees from inside.
How GATT is performed
Under gonioscopic view, a microcatheter or suture is threaded through Schlemm’s canal around the eye. The thread is then pulled through to cut the trabecular meshwork circumferentially.
- Creates a full-circle trabeculotomy to improve aqueous outflow
- Performed through a small incision without external filtering bleb
- Suitable for various types of open-angle glaucoma
- Can be combined with cataract surgery
Benefits and considerations
GATT can achieve significant pressure drops while preserving conjunctiva for future procedures. Early postoperative bleeding inside the eye is common but usually settles.
- Recovery is often quicker than traditional trabeculectomy
- Some patients still require medication after surgery
- Not ideal for eyes with heavily scarred angles or neovascularisation
- Long-term results depend on individual anatomy and disease severity
