If your glaucoma is not well controlled with eye drops, laser treatment, or other procedures, your doctor may recommend surgery. One of the most common options is a trabeculectomy.

Here, the BrightFocus Foundation explains what a trabeculectomy is, what happens during the procedure, and what you can expect afterward.*

What Is a Trabeculectomy and How Does It Work?

A trabeculectomy is a type of glaucoma surgery used to lower pressure inside your eye, also called intraocular pressure (IOP). High eye pressure can damage the optic nerve over time, which may lead to vision loss.

This procedure is often considered the “gold standard” for treating moderate-to-severe glaucoma when other treatments are no longer enough.

During the surgery, your eye surgeon creates a new drainage pathway for fluid inside your eye. Normally, fluid drains through a structure called the trabecular meshwork. In glaucoma, this drainage system does not work properly, causing pressure to build up.

Here’s what happens during the procedure:

• Your eye is numbed with local anesthesia, so you stay awake but do not feel pain
• The surgeon makes a tiny opening in the white part of your eye
• A small flap is created to help control how fluid drains
• Fluid is redirected to a small pocket under your eyelid

This small pocket is called a bleb. It acts like a new drainage area where fluid can collect and be absorbed by your body.

The surgery usually takes about an hour and is done in an operating room. Most people go home the same day.

What Happens After Surgery and During Recovery?

After a trabeculectomy, your eye needs time to heal—and this part is just as important as the surgery itself.

You will likely:

• Stop your previous glaucoma medications (unless your doctor says otherwise)
• Start using antibiotic and steroid eye drops to prevent infection and reduce swelling
• Attend several follow-up visits so your doctor can monitor healing

Recovery usually takes about 2 to 6 weeks, but your doctor will continue to monitor you beyond that.

One important thing to know: your body naturally tries to heal the surgical site, which can cause scarring. If too much scarring occurs, it can block the new drainage pathway.

To manage this, your doctor may:

• Use anti-scarring medications during or after surgery
• Inject medication during follow-up visits
• Adjust or release stitches in the flap
• Teach you a gentle eye massage technique to help control fluid flow

In some cases, your doctor may need to perform a small in-office procedure to break up scar tissue.

Think of this recovery phase as a “fine-tuning” period, your doctor is actively adjusting things to help the surgery work as well as possible.

What Are the Risks and Possible Complications?

Like any surgery, trabeculectomy comes with risks. The good news is that it has a strong track record. Studies show it can successfully control eye pressure in about 60% to 80% of patients for up to five years.

Still, complications can happen. These may include:

• Infection inside the eye
• Bleeding
• Vision changes or loss
• Eye pressure that becomes too low
• Faster development of cataracts
• A bleb that becomes large or uncomfortable

One important long-term risk is infection related to the bleb. This risk can remain even years after surgery, especially if anti-scarring medications were used.

Call your doctor right away if you notice:

• Eye pain or discomfort
• Increased redness
• Unusual tearing
• Pus-like discharge

Early treatment can make a big difference in protecting your vision.

Are There Other Surgical Options?

Yes—trabeculectomy is not the only option, though it is one of the most established.

Learn about a few other options here

One variation involves using a small device called an EX-PRESS shunt. This tiny metal tube helps drain fluid in a similar way but may offer:

• Faster visual recovery
• Less inflammation after surgery

However, it also has potential downsides, such as:

• Possible need for removal if infection occurs
• Risk of corneal damage if not placed correctly

The good news: the device does not interfere with MRIs or airport security, so no need to worry about setting off alarms.

Your doctor will help you decide which approach is best based on your specific condition, eye anatomy, and treatment history.

Learn more: A Quick Guide to Glaucoma Surgeries

Conclusion

A trabeculectomy is a well-established and effective surgery for lowering eye pressure when other glaucoma treatments are not enough. While the idea of eye surgery can feel overwhelming, understanding what to expect can help you feel more prepared and confident.

The most important takeaway? This procedure is not just about the surgery itself—it’s about the follow-up care and ongoing partnership with your doctor. Staying on top of your appointments and reporting any symptoms early can make a real difference in your outcome.

If your doctor recommends a trabeculectomy, don’t hesitate to ask questions and discuss your options. The goal is simple: protect your vision for the long term.

*BrightFocus Foundation. (July, 2021). “Glaucoma Surgery Series: Trabeculectomy.” brightfocus.org

The information provided by The Glaucoma Community is for educational purposes only and does not replace professional medical advice. Always talk with your healthcare provider before making changes to your treatment or care. The Glaucoma Community does not endorse specific treatments, providers, or products.