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Glaucoma can keep damaging the optic nerve when eye pressure remains too high despite medication or other treatments. In this situation, trabeculectomy surgery creates a new route for fluid to drain from the eye more effectively, thereby lowering intraocular pressure.
This surgery allows fluid to bypass areas where the eye’s natural drainage system no longer works effectively. During the trabeculectomy procedure, the surgeon creates a small opening at the upper part of the eye. Fluid passes through this opening and collects in a small reservoir called a trabeculectomy bleb, where surrounding tissue gradually absorbs it. This type of eye drainage surgery can lower intraocular pressure to a safer level and help protect the optic nerve from further damage from glaucoma.
For some patients, treatment lowers intraocular pressure but is not sufficient to protect the optic nerve. If glaucoma is still progressing despite anti-glaucoma medication or laser treatment, trabeculectomy for glaucoma may be considered to bring the pressure down further. The same may apply when the optic nerve needs a lower target pressure to limit additional vision loss.
The decision depends on several factors, including:
Vision already lost from glaucoma cannot be recovered with trabeculectomy. The surgery lowers intraocular pressure to limit further damage to the optic nerve. If glaucoma continues to progress, bringing the pressure down may slow further vision loss.
The amount of pressure reduction needed varies from person to person. The ophthalmologist sets a target based on the severity of glaucoma, existing vision loss, and the rate of disease progression.
The surgeon creates a small opening that lets fluid drain from the eye at a controlled rate. Several steps are involved in forming this new drainage route and keeping eye pressure from dropping too quickly.
1. Preparing the eye
Anesthesia keeps the eye comfortable during surgery. The surgeon works through the area at the upper part of the eye.
2. Creating a new drainage pathway
The surgeon creates a small flap in the white part of the eye and makes a small opening underneath it. This gives fluid inside the eye another way to drain.
3. Controlling the flow of fluid
The flap acts like a controlled outlet. The surgeon adjusts and secures it so fluid can gradually leave the eye without causing the pressure to fall too quickly.
4. Forming the filtering bleb
Fluid drains through the new opening and gathers beneath the tissue covering the eye. This small raised area is called a trabeculectomy bleb. From there, the fluid is absorbed into the surrounding tissue.
5. Reducing the risk of scarring
Scar tissue can interfere with fluid drainage as the eye heals. In some cases, the surgeon applies medication during and after surgery to limit scarring and help keep the opening functioning.
Trabeculectomy recovery happens gradually as the eye heals after surgery. Vision may remain blurry for a while, and the eye may feel different during the first few weeks. Trabeculectomy recovery time varies from person to person, so regular follow-up visits are an important part of the healing process, not just routine checks. The ophthalmologist monitors eye pressure and may adjust treatment as the eye heals.
During recovery, patients may need to:
The trabeculectomy bleb is more than a small raised area beneath the upper eyelid. It plays an important role in allowing fluid to drain after surgery and helps keep eye pressure under control.
As the eye heals, scar tissue can sometimes restrict drainage. Leakage or excessive drainage can also affect pressure. For this reason, the ophthalmologist closely monitors the bleb during follow-up visits and may recommend additional treatment if its function begins to change.
Work, driving, and exercise may need to be adjusted during the first few weeks after surgery.
Some soreness, swelling, or blurred vision may occur as the eye heals. Trabeculectomy complications, however, can affect eye pressure, vision, or the filtering bleb. Problems may develop if the eye drains too much or too little fluid, scar tissue restricts drainage, or the surgical area develops a leak or infection. Cataract formation and bleeding inside the eye are other possible risks.
Possible complications include:
Patients should contact their ophthalmologist promptly if they develop worsening vision, increasing eye pain, severe swelling, thick discharge, bleeding, or fever during recovery. These symptoms need medical assessment rather than waiting for the next scheduled follow-up visit.
Success after trabeculectomy is usually judged by how well the surgery controls eye pressure over time. In some cases, the target pressure can be maintained without glaucoma medication. In others, medication may still be needed even though the surgery continues to provide useful pressure control.
Results can also change over time as the eye heals and scar tissue develops around the filtering area. The surgery can maintain eye pressure control for many years in some patients, although others may eventually need additional treatment or a different glaucoma procedure.
Several factors can influence the outcome, including:
Scarring is one of the main reasons the surgery can become less effective over time, making postoperative monitoring an important part of maintaining eye pressure control.
The drainage opening can become less effective over time, particularly if scar tissue develops around the filtering bleb. Eye pressure may then begin to rise again.
Depending on the cause, the ophthalmologist may adjust medication, treat the bleb to improve drainage, perform a revision procedure, or consider another type of glaucoma surgery. Regular follow-up can identify changes in eye pressure before they lead to further optic nerve damage.
Glaucoma surgery can lower eye pressure in several ways, and trabeculectomy is only one option. Procedures such as goniotomy and tube shunt surgery use different approaches to improve fluid drainage and may suit different types or stages of glaucoma.
The choice depends on how much pressure needs to be lowered, previous treatments, the condition of the eye, and the risk of scarring or other complications.
Goniotomy and trabeculectomy lower eye pressure in different ways.
Neither procedure is automatically better for every patient. The ophthalmologist considers the type and severity of glaucoma, the target intraocular pressure, prior treatment, and the condition of the eye before deciding which surgical approach is most appropriate.
Both tube shunt surgery and trabeculectomy provide an alternative route for fluid to leave the eye, but they use different approaches.
The ophthalmologist considers the type and severity of glaucoma, previous eye surgery, the condition of the eye, the risk of scarring, and the target eye pressure when choosing between these procedures.
Other surgical options can also create a new drainage pathway without using a conventional tube-and-plate system. The PRESERFLO MicroShunt, for example, is a small implanted drainage device designed to lower intraocular pressure in primary open-angle glaucoma by directing fluid beneath the conjunctiva.
Trabeculectomy surgery can play an important role when glaucoma continues to progress despite medication, laser treatment, or other approaches. The right treatment, however, depends on the condition of the optic nerve, current eye pressure, previous treatment, and the pressure level needed to protect the remaining vision. At the Eyes Center, Vejthani International Hospital, ophthalmologists can assess these factors and recommend a glaucoma treatment plan tailored to each patient, whether that involves continued medical treatment, later treatment with trabeculectomy, or another surgical option.
Trabeculectomy is a type of glaucoma surgery that creates a new opening for fluid to drain from the eye. By improving fluid drainage, the procedure lowers intraocular pressure and reduces the risk of further optic nerve damage. It does not restore vision that glaucoma has already damaged.
The fluid redirected during trabeculectomy settles beneath the upper eyelid, leaving a slightly raised area known as a trabeculectomy bleb. This is part of the new drainage system created by the surgery. At follow-up visits, the ophthalmologist checks that the bleb is draining well and looks for scarring, leakage, or other changes that could interfere with intraocular pressure control.
Trabeculectomy surgery for glaucoma may be considered when eye drops or laser treatment do not lower intraocular pressure enough, when glaucoma continues to progress, or when a lower target pressure is needed to protect the optic nerve. The decision also depends on previous treatments, the type and severity of glaucoma, and the condition of the eye.
Trabeculectomy recovery time varies from person to person. Blurry vision and some discomfort can persist during the early healing period, and certain activities, such as heavy lifting or vigorous exercise, may need to be limited for several weeks. Follow-up visits are especially important during the first weeks because the ophthalmologist may need to monitor or adjust the new drainage opening to ensure it is working properly.
The main disadvantages of trabeculectomy are the need for close follow-up and the possibility of complications as the eye heals. Scar tissue can reduce drainage, while the eye may also develop pressure that is too low or too high, infection, leakage from the filtering bleb, bleeding, or cataract progression. Some patients may eventually need additional treatment if the drainage opening becomes less effective.
For more information, please contact
Eye Center, Vejthani International Hospital
Call: (+66)2-734-0000 Ext. 3260, 3264
English Hotline: (+66)85-223-8888
Ophthalmology
Ophthalmology - Glaucoma
