GATT is a minimally invasive glaucoma surgery performed using small micro-incisions in the cornea. After entering the eye, the trabecular meshwork is pierced, schlemm’s canal is then cannulated 360 degrees, and ultimately unroofed. This allows the whole drainage system of the eye to be targeted, allowing increased aqueous outflow and reduction of intraocular pressure. This procedure is minimally invasive and does not involve opening up the conjunctival tissue, making future glaucoma surgeries simpler if necessary. 

GATT is done in an ambulatory surgery center under local anesthesia and light intravenous sedation (like cataract surgery). In some cases an eye block may be done for additional anesthesia. Following this procedure you will be using post operative medications in addition to your glaucoma drops. If successful, you might be able to eliminate some of your glaucoma eye drops. Your surgeon will examine you the following day.