What is glaucoma surgery and what does it actually achieve?
Glaucoma surgery lowers the pressure inside the eye (intraocular pressure) by helping the fluid inside the eye, called aqueous humour, drain more easily or by making less of it. Glaucoma damages the optic nerve, and the damage is linked to pressure that is too high for that particular nerve. Lowering the pressure is the only proven way to slow the loss of side vision. The operation therefore aims to protect the sight you still have; it does not restore vision that has already been lost, and you may still need drops afterwards. Different glaucoma operations create a new drainage route, widen the natural one or reduce fluid production.
This guide covers when surgery is considered, how the main operations work, what the evidence says, what glaucoma surgery costs in Turkey and what recovery and risks to expect. For the condition as a whole and its non-surgical care see our page on glaucoma treatment, and for the wider specialty see eye treatments in Turkey.
When is surgery needed instead of drops or laser?
Most people start with eye drops, and many have laser treatment, which is often tried before or alongside drops. Surgery is usually considered when pressure remains too high despite medicines and laser, when the optic nerve or visual field keeps getting worse, when drops cause side effects or cannot be used reliably, or when the glaucoma is of a type that responds poorly to other treatment, such as some forms of angle-closure, neovascular or advanced disease. Your target pressure is set by the specialist and is lower if damage is advanced. Laser options such as laser trabeculoplasty and laser iridotomy are less invasive and are often offered earlier.
Which types of glaucoma surgery are there, and how do they differ?
The choice depends on the type and stage of glaucoma, your eye pressure, previous surgery, whether you also have a cataract and how low the pressure needs to be. The table summarises the main groups; your surgeon decides which suits your eye.
| Operation | Best suited to | Typical limits |
|---|---|---|
| Trabeculectomy | Moderate to advanced glaucoma needing a low pressure | More follow-up; risk of scarring and low pressure after surgery |
| Tube shunt (drainage implant) | Previous failed surgery, scarred or complex eyes | Tube and plate can move or erode; double vision or pressure changes |
| MIGS (micro-stents, canal procedures) | Mild to moderate glaucoma, often with cataract surgery | Smaller pressure drop than trabeculectomy |
| Cyclo-laser (cyclophotocoagulation) | Advanced or painful glaucoma with poor vision | Can reduce fluid production but may need repeating |
Surgery is also sometimes combined with a cataract operation; see cataract lens surgery.
How does a trabeculectomy work?
Trabeculectomy has been the standard operation for decades. Under local anaesthetic, sometimes with sedation, the surgeon makes a small flap in the white of the eye (sclera) under the upper eyelid and removes a tiny piece of tissue beneath it. Fluid can now escape through this opening into a small blister, called a bleb, under the conjunctiva, and the body absorbs it. A medicine such as mitomycin C is often used to stop scarring from closing the opening. The surgery takes about 45 to 60 minutes. It can lower the pressure more than most other operations, but it needs close monitoring in the weeks that follow, and sometimes small adjustments in clinic, such as removing a stitch or an injection to reduce scarring.
What are tube shunts and MIGS?
A tube shunt, such as an Ahmed, Baerveldt or similar device, is a flexible tube connected to a small plate sewn on the outside of the eye. It carries fluid to the plate, where it is absorbed, and it is used when trabeculectomy has failed or is unlikely to work. Minimally invasive glaucoma surgery (MIGS) includes micro-stents placed in the natural drainage system or a small gel stent that drains under the conjunctiva, and procedures that open the natural angle with a blade or laser. These are done through very small cuts, usually with fewer complications, a quicker recovery and less intensive follow-up, but the pressure reduction is more modest. MIGS is often combined with cataract surgery in people with mild to moderate disease.
Does glaucoma surgery work?
Surgery reliably lowers pressure in most eyes, and studies of eyes with advanced glaucoma show that lower pressure slows progression. In trials comparing operations, trabeculectomy generally lowers pressure more than tube shunts or MIGS, while MIGS and shunts have lower complication rates. Success depends on how it is defined: a surgeon may count a pressure below a certain level with or without drops. Over the years, scarring can raise the pressure again, and some people need further surgery or return to drops. The goal is to keep your sight stable for life, not to cure the disease. Glaucoma is lifelong, and regular checks continue after surgery, so a trustworthy surgeon will not promise that vision will improve or that drops can always be stopped.
Who is and who is not a good candidate?
Good candidates are people with confirmed glaucoma that is progressing despite maximum reasonable treatment, who can attend checks and use drops after surgery. Suitability also depends on your eye: inflammation, previous surgery, thin or scarred conjunctiva, neovascular glaucoma, contact lens use and vision in the other eye all change the plan. Blood thinners, diabetes, high blood pressure and difficulty lying still are discussed with the anaesthetist. Because the effect of surgery is mostly preventive, people with mild disease that is well controlled usually do not need it. A thorough pre-operative examination with pressure readings, optic nerve imaging (OCT) and a visual field test is essential, so bring your records.
Glaucoma surgery cost in Turkey compared with the UK, US and Germany
The figures below are approximate ranges per eye, not hospital quotes. The glaucoma surgery price depends on the operation, the device used, whether it is combined with cataract surgery, the type of anaesthetic, the hospital stay and follow-up visits.
| Country | Approximate cost range |
|---|---|
| Turkey | €1,500 – €5,500 per eye |
| United Kingdom | €3,500 – €9,000 per eye |
| United States | €5,000 – €16,000 per eye |
| Germany | €3,000 – €8,000 per eye |
The lower end applies to simpler procedures; implants such as tubes or gel stents raise the price because the device is a significant part of the cost. A package normally covers the examinations, the surgery, anaesthetist, medicines and early check-ups. Ask in writing which device is used, how many follow-up visits are included and whether treatment of complications is covered.
What is recovery like after glaucoma surgery?
Recovery depends on the operation. After MIGS, vision is often usable within a day and drops are used for four to six weeks. After trabeculectomy or a tube, the eye is red and sore for a week or two, vision is blurry for several weeks and the eye is protected with a shield at night. You will have several appointments in the first weeks, often on days 1, 7 and 14 and then at longer intervals, so the surgeon can adjust drops and the drainage. Typical instructions include using antibiotic and steroid drops on a schedule, avoiding rubbing or pressing on the eye, avoiding swimming and dusty places for about a month, and no heavy lifting or bending for a couple of weeks.
Most people stay in Turkey for 7 to 10 days after trabeculectomy or a tube, so that early checks can be done before flying, and for a shorter stay of 3 to 5 days after MIGS. Plan follow-up with an ophthalmologist at home, and agree in advance what records will be sent to them.
What results can I realistically expect?
You will not see a visible difference in how the eye looks, apart from redness that fades. Pressure readings, a stable optic nerve scan and a steady visual field are the measures of success. Many people find their vision is slightly worse for several weeks and then returns to its previous level, though it is normal for a small change in glasses prescription to follow trabeculectomy. Some need fewer or no drops, while others still need some. Ask the surgeon for their own success figures for your operation and what pressure they are aiming for.
What are the risks of glaucoma surgery?
All eye surgery carries risk. Common early effects are redness, discomfort, blurred vision, watering and a raised or low pressure that is corrected during follow-up. Possible complications include infection inside the eye (endophthalmitis), bleeding, very low pressure with swelling at the back of the eye, a leaking bleb, cataract formation or progression, double vision with tube implants and, rarely, loss of vision. Scarring can close the new drain over time. The Royal College of Ophthalmologists and the American Academy of Ophthalmology advise that the benefit of surgery is slowing sight loss and that the risks should be weighed against the danger of uncontrolled pressure. Contact the team urgently if there is increasing pain, loss of vision, or pus.
How to choose a surgeon and hospital, and red flags
Look for an ophthalmologist who specialises in glaucoma, performs the operation you need regularly, explains why that operation suits your eye, reviews your OCT and visual field records and gives a written plan including follow-up. Check that the hospital is licensed and has the equipment for pressure and imaging checks. Red flags include promises that vision will be restored or that you will not need drops, a quote before any examination, no plan for aftercare when you leave, and pressure to book quickly. Read how our process works and send your records through our free quote page to have a hospital review them.
What should I ask the surgeon before booking?
- Which operation do you recommend for my type of glaucoma and why?
- What eye pressure are you aiming for, and could I still need drops?
- Which device or medicine will be used, and is it included in the price?
- How many days must I stay, and how many check-ups will I need?
- What will you do if the pressure is too low or too high after surgery?
- Can you coordinate with my ophthalmologist at home?
Conditions treated with Glaucoma Surgery
Hospitals with Eye Surgery in Turkey
Frequently asked questions
It is an operation that lowers pressure inside the eye by improving fluid drainage or reducing fluid production, to protect the optic nerve and slow sight loss. It does not restore vision that has already been lost.
It lowers eye pressure in most eyes and slows progression when pressure was the problem. Trabeculectomy generally lowers pressure the most, and MIGS and tubes carry different trade-offs. Lifelong monitoring is still needed.
Approximate ranges are €1,500 to €5,500 per eye in Turkey, against about €3,500 to €9,000 in the UK. The price depends on the operation, any implant used and whether it is combined with cataract surgery.
The main types are trabeculectomy, tube shunts, minimally invasive glaucoma surgery (MIGS) with micro-stents or canal procedures, and cyclo-laser to reduce fluid production. The right one depends on your glaucoma type, stage and eye.
The eye is numbed with local anaesthetic, sometimes with sedation, so you should feel pressure but not pain. Afterwards the eye can be sore and gritty for a week or two.
After MIGS vision often recovers in a day or two. After trabeculectomy or a tube, expect redness and blurred vision for several weeks and frequent checks in the first month.
Some people can stop or reduce drops, while others still need some to reach their target pressure. Your surgeon should explain what to expect for your eye.
No. It aims to prevent further loss by lowering the pressure. Damage that has already happened to the optic nerve cannot be reversed.
MIGS usually has fewer complications and a quicker recovery but lowers pressure less. It suits mild to moderate disease, while trabeculectomy is chosen when a lower pressure is needed.
After MIGS about three to five days is common. After trabeculectomy or a tube, seven to ten days allows early pressure checks before flying. The surgeon confirms the plan.