Glaucoma Surgery
Surgery types, recovery, NHS vs private options, and FAQs
Overview
Glaucoma is a group of eye conditions in which the optic nerve is progressively damaged, usually due to raised pressure inside the eye (intraocular pressure, or IOP). It is the leading cause of irreversible blindness worldwide and affects approximately 700,000 people in the UK, though it is estimated that up to half of those with glaucoma are undiagnosed because the condition often develops without noticeable early symptoms.
The most common form, primary open-angle glaucoma, develops slowly over many years and typically causes a gradual loss of peripheral vision. Less common but more acute forms, such as angle-closure glaucoma, can cause sudden symptoms including severe eye pain, headache, and rapid vision loss requiring emergency treatment. Once vision is lost to glaucoma, it cannot be restored, which makes early detection through regular eye tests critically important.
Treatment for glaucoma aims to lower the pressure inside the eye to prevent further damage to the optic nerve. While eye drops are usually the first-line treatment, surgery may be recommended when drops are insufficient, poorly tolerated, or when the disease is progressing despite medical therapy. Advances in surgical techniques, including minimally invasive glaucoma surgery (MIGS), have significantly expanded the options available to patients in recent years.
Symptoms
- Gradual loss of peripheral (side) vision, often unnoticed until advanced
- Tunnel vision in later stages of the disease
- Blurred vision that cannot be corrected with glasses
- Haloes or rainbow-coloured rings around lights
- Difficulty adjusting to dark rooms
- In acute angle-closure glaucoma: sudden severe eye pain, headache, nausea, vomiting, and red eye
- Eye pressure or aching sensation around the eye
When Surgery is Needed
Surgery for glaucoma is typically recommended when other treatments have not adequately controlled the intraocular pressure, or when the disease is progressing despite maximum medical therapy. Your ophthalmologist may recommend surgery when:
- Eye drops are not sufficiently lowering your eye pressure
- You are unable to tolerate the side effects of eye drop medications
- You have difficulty using eye drops consistently (adherence problems)
- The glaucoma is advanced at diagnosis and requires more aggressive pressure reduction
- You have a type of glaucoma that responds better to surgical intervention
Recent UK research, including the landmark LiGHT trial, has shown that selective laser trabeculoplasty (SLT) can be as effective as eye drops as a first-line treatment. NICE now supports the use of SLT as an initial treatment option, and it is increasingly offered early in the treatment pathway rather than as a last resort.
Types of Surgery
Selective Laser Trabeculoplasty (SLT)
A quick outpatient laser procedure that improves the drainage of fluid from the eye by targeting the trabecular meshwork. SLT takes about 5 minutes, is performed under local anaesthetic drops, and can reduce eye pressure by 20-30%. It can be repeated if the effect diminishes over time. Now supported by NICE as a first-line treatment.
Trabeculectomy
The most established surgical procedure for glaucoma. A small flap is created in the sclera (white of the eye) to create a new drainage channel, allowing fluid to drain into a small blister (bleb) under the conjunctiva. It is highly effective at reducing eye pressure but requires careful post-operative monitoring. Recovery takes several weeks.
Tube shunt (glaucoma drainage device)
A tiny silicone tube is implanted in the eye to drain aqueous fluid to a small plate positioned on the outside of the eye. This procedure is often used when trabeculectomy has failed or for complex glaucoma cases. Common devices include the Baerveldt and Ahmed valves.
Minimally Invasive Glaucoma Surgery (MIGS)
A group of newer procedures that use microscopic incisions and tiny implants to improve fluid drainage from the eye. MIGS procedures, including iStent, Hydrus, and Xen gel stent, are less invasive than traditional surgery, have faster recovery times, and are often combined with cataract surgery. They are best suited for mild to moderate glaucoma.
Laser Peripheral Iridotomy (LPI)
A laser is used to create a tiny hole in the peripheral iris, allowing fluid to flow more freely within the eye. This is the standard treatment for angle-closure glaucoma and is also used preventively in eyes at risk of angle closure. The procedure takes a few minutes and is performed as an outpatient.
Recovery
Recovery from glaucoma surgery varies depending on the type of procedure performed. SLT laser treatment has minimal recovery time — most patients can return to normal activities the same day, though mild inflammation or discomfort may last a few days.
For trabeculectomy, recovery is more involved. You will need to use anti-inflammatory and antibiotic eye drops for several weeks, and your surgeon will see you frequently in the first month to monitor healing and adjust the drainage as needed. You should avoid heavy lifting, bending, and strenuous exercise for 2-4 weeks. Full recovery typically takes 6 to 8 weeks.
MIGS procedures generally have a faster recovery, particularly when performed alongside cataract surgery. Most patients return to normal activities within a few days to a week.
Regardless of the procedure, you will require lifelong monitoring. Glaucoma is a chronic condition that cannot be cured, only managed. Regular follow-up appointments and, in many cases, continued use of eye drops alongside surgery are essential to protect your remaining vision.
NHS vs Private
Glaucoma treatment, including surgery, is widely available on the NHS. SLT laser treatment, trabeculectomy, tube shunts, and some MIGS procedures are all funded by the NHS when clinically indicated. NHS waiting times for glaucoma surgery vary by region but are typically 6 to 12 weeks from referral.
Private glaucoma treatment offers faster access to consultant ophthalmologists, shorter waiting times for surgery, and potentially greater choice in the type of MIGS device used. Private SLT laser treatment typically costs £795 to £995, while surgical procedures such as trabeculectomy start from around £2,995.
If you are aged 40 or over and have a first-degree relative (parent, sibling, or child) with glaucoma, you are entitled to free NHS eye tests, regardless of your age. This is one of the most important steps you can take for early detection.
Frequently Asked Questions
Can glaucoma be cured with surgery?
What is SLT and is it better than eye drops?
Is glaucoma surgery painful?
How successful is glaucoma surgery?
Will I still need eye drops after glaucoma surgery?
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