Diagnosis and Medical Evaluations
To determine if glaucoma surgery is necessary, an ophthalmologist performs:
- Tonometry: Measures intraocular pressure (IOP).
- Ophthalmoscopy: Examines the optic nerve for damage.
- Perimetry (Visual Field Test): Evaluates vision loss.
- Gonioscopy: Assesses the drainage angle of the eye.
- Optical Coherence Tomography (OCT): Provides detailed imaging of the optic nerve and retinal layers.
Types of Glaucoma Surgery
1. Laser Surgery for Glaucoma
Minimally invasive procedures that use laser energy to improve fluid drainage.
✔ Selective Laser Trabeculoplasty (SLT):
- Used for open-angle glaucoma.
- Laser energy targets the trabecular meshwork to enhance fluid outflow.
- Performed in a few minutes with minimal discomfort.
- Effectiveness may last 3-5 years, but repeat treatments may be needed.
✔ Laser Peripheral Iridotomy (LPI):
- Used for angle-closure glaucoma.
- A small hole is created in the iris to allow fluid drainage.
- Prevents sudden pressure spikes that could cause blindness.
✔ Cyclophotocoagulation (CPC):
- Reduces the production of intraocular fluid by targeting the ciliary body with a laser.
- Used for advanced or refractory glaucoma cases.
2. Trabeculectomy (Traditional Incisional Surgery)
✔ Procedure:
- A small flap is created in the white part of the eye (sclera) to allow fluid drainage.
- A new drainage pathway (filtering bleb) is formed to lower eye pressure.
- Typically recommended when laser treatments and medications fail.
✔ Recovery:
- Requires post-surgery monitoring for pressure control.
- Patients may need anti-scarring eye drops to prevent closure of the drainage pathway.
- Long-lasting pressure reduction, but complications like infection or scarring may occur.
3. Glaucoma Drainage Implants (Tube Shunt Surgery)
✔ Procedure:
- A small drainage tube (shunt) is implanted in the eye to direct excess fluid to an external reservoir.
- Used for severe or complicated glaucoma cases (e.g., after previous failed surgeries).
✔ Benefits:
- Effective long-term control of IOP in advanced cases.
- Requires regular follow-up to ensure the implant remains functional.
4. Minimally Invasive Glaucoma Surgery (MIGS)
✔ Procedures:
- Involves small incisions and micro-stents to improve fluid drainage.
- Examples: iStent, Hydrus Microstent, Xen Gel Stent.
✔ Advantages:
- Faster recovery and fewer complications than traditional surgery.
- Often performed along with cataract surgery.
- Suitable for mild to moderate glaucoma cases.
How the Surgery is Performed
1. Preparing for Surgery:
- Patients may need to stop certain medications (e.g., blood thinners).
- Pre-surgical eye drops are used to prevent infections.
- The procedure is usually done under local anesthesia (patient remains awake but does not feel pain).
2. Surgical Procedure:
- The ophthalmologist creates a new drainage pathway or implants a drainage device.
- The surgery takes 30 minutes to 1 hour, depending on the technique.
- Eye drops or medications are prescribed post-surgery to prevent inflammation or infection.
3. Post-Surgery Recovery:
- Vision may be blurry for a few days.
- Avoid strenuous activities and direct sunlight for a few weeks.
- Regular follow-up visits are required to monitor eye pressure.
Recovery and Aftercare
1. First Few Weeks Post-Surgery:
- Use prescribed eye drops to prevent infection and inflammation.
- Avoid rubbing or pressing on the eye.
- Wear protective eyewear if needed.
2. Long-Term Monitoring:
- Some patients may still need glaucoma medications after surgery.
- Regular eye exams are necessary to track eye pressure.
Potential Complications of Glaucoma Surgery
- Infection or inflammation.
- Scarring that blocks drainage (may require revision surgery).
- Low intraocular pressure (hypotony), causing blurry vision.
- Bleeding inside the eye (rare).
- Cataract development (in some cases).
Success Rate and Long-Term Outlook
- Trabeculectomy and drainage implants reduce eye pressure by 50-80%.
- Laser surgery is successful in 70-85% of cases, but some patients need repeat treatments.
- MIGS procedures offer moderate IOP reduction with fewer risks.
- Early diagnosis and post-surgical follow-up are critical for maintaining vision.
