Glaucoma Surgery in Oman (Trabeculectomy & Drainage Procedures)
Surgery to lower eye pressure and protect your remaining sight when drops and laser are not enough.
Glaucoma surgery lowers eye pressure when eye drops and laser treatment cannot control it, to protect the optic nerve from further damage. Finland Eye Center performs trabeculectomy at its Muscat, Sohar and Salalah clinics; it is the long-established glaucoma operation that creates a new drainage channel so fluid can leave the eye. Surgery cannot restore vision already lost to glaucoma, but it can help preserve the sight you have.
Key facts
- Procedure
- Trabeculectomy (glaucoma filtration surgery)
- Purpose
- Lower eye pressure to protect the optic nerve
- Usually considered when
- Pressure stays too high, or damage keeps progressing, despite drops or laser
- Anaesthesia
- Usually local anaesthesia; most patients go home the same day
- Follow-up
- Frequent visits in the first weeks, then lifelong glaucoma monitoring
- Where to start
- A glaucoma assessment at any of our clinics
When is glaucoma surgery needed?
Most people with glaucoma are first treated with daily eye drops, laser, or both. Your ophthalmologist may recommend surgery when:
- Eye pressure stays above your target level despite the drops and laser you can use.
- Tests (OCT scans of the optic nerve and visual field tests) show glaucoma damage is still getting worse.
- Drops cause side effects you cannot tolerate, or using them every day is not practical.
- Glaucoma is already advanced and needs a lower pressure than drops can achieve.
The decision depends on your type and stage of glaucoma, your other eye conditions and your general health. It is made with you at a consultation, not on a single pressure reading.
What is trabeculectomy?
Trabeculectomy is an operation that makes a small, controlled opening in the wall of the eye, under the upper eyelid. Fluid from inside the eye drains through this opening into a small reservoir under the thin surface layer of the eye, called a bleb, where it is absorbed by the body. This lowers the pressure inside the eye.
How does it lower eye pressure?
In glaucoma, the eye’s natural drainage system often does not let enough fluid out, so pressure builds up. Trabeculectomy creates a new route that bypasses it. The surgeon adjusts stitches to control how much fluid flows out, and a medicine is often applied during surgery to reduce scarring, which could otherwise close the new channel.
What happens on the day of surgery?
- The eye is numbed with a local anaesthetic, and you may be given medicine to help you relax.
- The surgeon creates the drainage opening and a small flap in the white of the eye, under the upper eyelid, and closes it with fine stitches.
- A shield is placed over the eye. Most patients go home the same day with a schedule of eye drops.
- You are seen again the next day, then often during the following weeks, while the surgeon adjusts healing and pressure.
How does surgery compare with other glaucoma treatments?
Surgery is one of several ways to lower eye pressure. This table is general information about the main options; not every option suits every type of glaucoma.
| Option | How it lowers eye pressure | Where / how | Typical use | Things to know |
|---|---|---|---|---|
| Eye drops | Reduce fluid production or improve drainage | Daily, at home | First-line for most open-angle glaucoma | Must be used every day; may cause redness or irritation |
| SLT laser (selective laser trabeculoplasty) | Laser improves drainage through the eye’s natural outflow | In clinic, a few minutes, no incision | First-line, or added to drops | Effect can wear off over years; can be repeated |
| Laser iridotomy | Small laser opening in the iris | In clinic | Narrow angles and angle-closure glaucoma | Helps prevent attacks; does not treat open-angle glaucoma |
| Trabeculectomy | Creates a new drainage channel under the eyelid | Operating theatre | When pressure stays high despite drops or laser | Needs close follow-up in the first weeks |
| Drainage tube or valve | A small implant carries fluid out of the eye | Operating theatre | Complex glaucoma or eyes that have had previous surgery | Your surgeon explains the device chosen |
| MIGS (minimally invasive glaucoma surgery) | A tiny device or channel improves drainage through a very small incision | Operating theatre, often with cataract surgery | Mild to moderate glaucoma | Faster recovery; usually a smaller pressure drop than trabeculectomy |
Trabeculectomy is performed at Finland Eye Center. Which of the other options suit your eye, and where they are available, is discussed at your consultation.
What are the risks, and what is recovery like?
Recovery and follow-up
- Vision in the operated eye is often blurred for a few weeks while the eye heals.
- You use antibiotic and anti-inflammatory drops for several weeks. Your surgeon tells you which glaucoma drops to stop or continue.
- Avoid rubbing the eye, swimming, heavy lifting and dusty work until your surgeon says it is safe.
- Many people need about two weeks off work, depending on their job.
- Some people still need drops, or a further procedure, to keep pressure on target in the long term.
Possible risks
Trabeculectomy is an established operation, but like any surgery it carries risks. Your surgeon discusses your personal risk before you decide.
- Pressure that is too low or too high in the first weeks, which may need adjustment of the stitches or medicines.
- Scarring that slows or closes the new channel, so further treatment is needed.
- Bleeding or inflammation inside the eye.
- Faster development of cataract in the operated eye.
- Infection inside the eye or of the bleb, which is uncommon but can happen even years later.
Where can I have a glaucoma assessment?
Glaucoma assessment and follow-up start at any of our clinics. Glaucoma surgery, including trabeculectomy, is performed at our Muscat (Qurum), Sohar and Salalah clinics; patients seen in Nizwa are referred to one of them. If surgery is recommended, you will be told which surgeon will operate.
Glaucoma surgery: frequently asked questions
When is trabeculectomy recommended?
Trabeculectomy is usually recommended when eye pressure stays above your target despite the drops and laser you can use, when OCT scans and visual field tests show glaucoma damage is still getting worse, when drops cause side effects you cannot tolerate, or when advanced glaucoma needs a lower pressure than drops can achieve. The decision is made with you at a consultation.
Does glaucoma surgery restore lost vision?
No. Vision already lost to glaucoma cannot be restored by surgery or any other treatment. The aim of surgery is to lower eye pressure enough to slow or stop further damage, so you keep the sight you still have.
Is trabeculectomy painful?
The eye is numbed with local anaesthetic, so most people feel pressure rather than pain during the operation. Afterwards the eye usually feels gritty or sore for a few days, which drops and simple painkillers help. Severe or increasing pain is not expected and should be reported the same day.
How long does recovery take after trabeculectomy?
Most people go home the same day. Vision is often blurred for a few weeks, and you use drops and attend frequent check-ups during the first one to two months while the surgeon fine-tunes healing and pressure. Many people return to office work after about two weeks.
Will I still need glaucoma drops after surgery?
Many people can stop some or all glaucoma drops in the operated eye, but not everyone. Some still need drops to keep pressure on target, and glaucoma needs regular monitoring for life, whatever treatment you have had.
What is the difference between trabeculectomy and a drainage tube?
Both are operations that lower eye pressure by letting fluid leave the eye. Trabeculectomy creates a new drainage channel under the upper eyelid from the eye’s own tissue. A drainage tube or valve is a small implant that carries fluid out of the eye, often used for complex glaucoma or eyes that have had previous surgery. Your surgeon explains which suits your eye, and where it is available, at your consultation.
Sources
- National Eye Institute (NEI): Glaucoma
- American Academy of Ophthalmology: What Is Glaucoma?
- Gazzard G. et al. Selective laser trabeculoplasty versus eye drops for first-line treatment of ocular hypertension and glaucoma (LiGHT). The Lancet, 2019.
This page is general information and does not replace a medical consultation. Your ophthalmologist will recommend the treatment that suits your eyes.
Talk to us about glaucoma surgery
If your eye pressure is hard to control, book a glaucoma assessment. We will review your tests and explain every option, including surgery.