Trabeculectomy

What is a trabeculectomy?

A trabeculectomy is a type of glaucoma surgery performed to lower pressure inside the eye (intraocular pressure). It is usually recommended when eye drops, laser treatment, or other medications have not lowered the pressure enough to protect the optic nerve.

Why is a trabeculectomy needed?

In glaucoma, fluid inside the eye (aqueous humor) does not drain properly. This causes pressure to build up, which can damage the optic nerve and lead to permanent vision loss. A trabeculectomy creates a new drainage pathway so fluid can leave the eye more easily, helping to reduce pressure and slow or prevent further vision damage.

How does the procedure work?

During the surgery, the ophthalmologist creates a tiny flap in the white part of the eye (the sclera). A small opening is made underneath this flap to allow fluid to drain out of the eye and collect in a small reservoir (called a “bleb”) under the upper eyelid. The fluid is then naturally absorbed into the bloodstream.

​​​​​​​The procedure is typically performed under local anesthesia with sedation, though it can also be done under general anesthesia in some cases. It is usually carried out as a day surgery.