Understanding Minimally Invasive Glaucoma Surgery

When glaucoma cannot be adequately controlled with eye drops or laser treatment alone, surgical intervention may be recommended. Over the past decade, new techniques known as Minimally Invasive Glaucoma Surgery (MIGS) have expanded treatment options for many patients.

MIGS procedures are designed to lower eye pressure with less tissue disruption, faster recovery, and a favorable safety profile compared to traditional glaucoma surgery. This page explains what MIGS is, how it works, and when it may be appropriate.

What Is MIGS?

MIGS stands for Minimally Invasive Glaucoma Surgery. It refers to a group of surgical procedures that:

• Lower intraocular pressure (IOP)
  
• Improve fluid drainage from the eye
  
• Minimize surgical trauma
  
• Reduce recovery time
  

MIGS is not a single procedure, but a category of techniques.

How MIGS Differs From Traditional Glaucoma Surgery

Traditional Glaucoma Surgery

Examples include trabeculectomy or tube shunt surgery.

These procedures:

• Are highly effective at lowering eye pressure
  
• Are more invasive
  
• Carry higher risk of complications
  
• Require longer recovery and intensive follow-up
  

MIGS Procedures

MIGS aims to:

• Lower eye pressure more gently
  
• Preserve eye anatomy
  
• Reduce dependence on medications
  
• Minimize complication risk
  

Because of this, MIGS is often considered earlier in the treatment pathway.

When MIGS Is Typically Recommended

MIGS may be recommended for patients who:

• Have mild to moderate open-angle glaucoma
  
• Need additional pressure reduction beyond drops or laser
  
• Have difficulty tolerating glaucoma medications
  
• Are undergoing cataract surgery and have glaucoma
  

MIGS is not appropriate for all types or stages of glaucoma.

MIGS and Cataract Surgery

Many MIGS procedures are commonly performed at the same time as cataract surgery.

Benefits of combined surgery may include:

• One surgical event instead of two
  
• Lower eye pressure after cataract removal
  
• Reduced need for glaucoma drops
  
• Streamlined recovery
  

This combined approach is common when both cataracts and glaucoma are present.

Common Types of MIGS Procedures

Different MIGS procedures target different drainage pathways in the eye.

Trabecular Meshwork–Based MIGS

These procedures improve outflow through the eye’s natural drainage system.

They are often used for:

• Open-angle glaucoma
  
• Mild to moderate disease
  

Suprachoroidal MIGS

These procedures enhance alternative drainage pathways within the eye.

Used selectively based on anatomy and risk profile.

Subconjunctival MIGS

These procedures create a controlled drainage pathway beneath the eye’s surface.

They may provide greater pressure reduction but involve more intervention than other MIGS techniques.

What to Expect During MIGS Surgery

MIGS procedures are typically:

• Performed in an outpatient surgical setting
  
• Completed quickly
  
• Done with local anesthesia
  
• Often combined with cataract surgery
  

Patients are usually awake and comfortable during the procedure.

Recovery After MIGS

Recovery from MIGS is generally:

• Faster than traditional glaucoma surgery
  
• Similar to cataract surgery recovery when combined
  
• Associated with minimal discomfort
  

Patients may experience:

• Temporary blurred vision
  
• Mild inflammation
  
• Short-term medication adjustments
  

Effectiveness of MIGS

MIGS procedures:

• Lower eye pressure modestly to moderately
  
• Often reduce the number of glaucoma medications needed
  
• Do not typically replace more aggressive surgery in advanced disease
  

The goal is pressure control with a strong safety profile, not maximal pressure lowering.

Limitations of MIGS

MIGS may not be appropriate if:

• Glaucoma is advanced
  
• Very low eye pressure is required
  
• Certain anatomical features are present
  

In these cases, traditional glaucoma surgery may be more effective.

MIGS vs Laser vs Drops

Treatment selection is individualized.

Long-Term Outlook After MIGS

After MIGS:

• Many patients continue some form of glaucoma treatment
  
• Medication burden is often reduced
  
• Ongoing monitoring is essential
  

MIGS is a tool for long-term management, not a cure.

Surgeon Experience Matters

Outcomes with MIGS depend on:

• Proper patient selection
  
• Surgeon experience
  
• Understanding of glaucoma progression
  

An experienced surgeon knows when MIGS is appropriate — and when it is not.

Shared Decision-Making in Glaucoma Surgery

Choosing glaucoma surgery is a collaborative process. Patients should understand:

• Why surgery is recommended
  
• What MIGS can and cannot do
  
• How it fits into long-term care
  

Education leads to confidence and better adherence.

Glaucoma Surgery Education You Can Trust

At Eye Surgery Today, we believe patients deserve clear explanations about surgical options — including newer techniques like MIGS. Our goal is to help patients understand why surgery is recommended and how it fits into protecting vision for the long term.