Being told you have glaucoma can raise an immediate concern: will you eventually need surgery? For many patients, treatment begins with eye drops or laser procedures to lower eye pressure and protect the optic nerve. Surgery is often considered when these measures do not provide sufficient control, although earlier surgery may be appropriate when glaucoma is advanced or the risk of further damage is high.
The decision depends on more than eye pressure alone. The severity and progression of glaucoma, the condition of the optic nerve and how well previous treatments have worked can all influence whether surgery is recommended. Knowing how these factors are assessed can help you better understand when glaucoma surgery may form part of your treatment plan.
When Surgery May Be Recommended
Glaucoma surgery may be recommended when eye pressure remains above the target level despite treatment, or when tests show that the condition is continuing to progress. Your doctor will consider the severity of glaucoma, the extent of optic nerve damage and how well you have responded to eye drops or laser treatment before deciding whether surgery is appropriate.
Eye Pressure Remains Above Target
If eye drops or laser treatment cannot lower eye pressure to the level needed to protect the optic nerve, surgery may be considered to achieve a greater reduction.
Glaucoma Progresses Despite Apparently Controlled Eye Pressure
Further optic nerve damage or visual field loss can show that the existing target pressure is not low enough. Surgery may then be considered to lower pressure further.
Glaucoma Is Already Advanced
When substantial damage is present at diagnosis, there may be less room for further vision loss. Surgery may therefore be considered earlier to achieve a lower and more stable eye pressure.
Eye Drops Are Not Suitable For Long-Term Control
Significant side effects, difficulty administering drops or a complex medication regimen can make pressure control unreliable. Surgery may reduce dependence on daily medication in suitable patients.
If glaucoma remains inadequately controlled, further optic nerve damage can occur and vision already lost from glaucoma cannot be restored. This is why treatment may need to be escalated before a major change in vision becomes noticeable.
How Doctors Assess Whether Glaucoma Surgery Is Needed
To determine whether any of these situations apply, your ophthalmologist considers several findings together rather than relying on a single eye pressure reading. These may include:
- Eye pressure over time: Current readings and previous measurements help determine whether pressure is consistently within the target range.
- Optic nerve changes: Examination and imaging, such as optical coherence tomography (OCT), can show whether structural damage is progressing.
- Visual field results: Visual field testing helps identify whether glaucoma-related vision loss is worsening over time.
- Response to previous treatment: Your ophthalmologist considers how effectively eye drops or laser treatment have controlled the condition.
- Individual considerations: Glaucoma severity, rate of progression, age, overall eye health and other eye conditions can influence the treatment approach and target eye pressure.
Together, these findings help determine whether continued medical or laser treatment remains appropriate or whether surgery may provide the level of pressure control needed.
How the Type of Glaucoma Can Influence the Decision for Surgery
The type of glaucoma affects how eye pressure becomes elevated, which treatments are likely to work and how much pressure reduction may be needed. As a result, the point at which surgery is considered can differ between patients.
Open-Angle Glaucoma
In open-angle glaucoma, surgery may be considered when eye drops or selective laser trabeculoplasty (SLT) are no longer achieving the target eye pressure, or when optic nerve damage continues to progress despite treatment. The amount of pressure reduction required and the severity of glaucoma help determine whether surgery is appropriate and which procedure may be considered.
Angle-Closure Glaucoma
For angle-closure glaucoma, treatment also needs to address the narrowing or closure of the eye's drainage angle. Laser peripheral iridotomy is commonly used to relieve pupillary block, while lens surgery may be considered when the lens contributes to angle closure. Glaucoma surgery may be needed when eye pressure remains inadequately controlled or significant glaucoma damage is already present.
Ultimately, the type of glaucoma is considered alongside the target eye pressure, extent of optic nerve damage and response to previous treatment when deciding whether surgery is needed and which approach may be suitable.
Discuss Glaucoma Surgery at Eye & Glaucoma Surgeons
The decision to proceed with glaucoma surgery is individualised. The aim is to determine whether surgery can provide better eye pressure control when current treatment is no longer sufficient or when the risk of further glaucoma damage warrants a different approach.
At Eye & Glaucoma Surgeons, glaucoma care spans the full range of treatment options, allowing patients to receive ongoing care from initial pressure control through to laser treatment and surgery when required. Fellowship-trained in glaucoma, Dr Daniel Su brings dedicated experience in managing complex and progressive glaucoma, including assessing when surgery may offer more effective pressure control.
If you have been advised to consider surgery or your glaucoma is becoming difficult to control, book an appointment at our glaucoma surgery clinic in Singapore to discuss the treatment options that may be appropriate for your eyes.
