Filtering blebs: follow up of trabeculectomy

Area of Science:

• Ophthalmology
• Glaucoma Surgery
• Surgical Outcomes

Background:

• Trabeculectomy is a common surgical procedure for glaucoma.
• Filtering bleb morphology and function are crucial for successful IOP control.
• Understanding factors influencing bleb success is vital for patient management.

Purpose of the Study:

• To correlate filtering bleb appearance and function with intraocular pressure (IOP) after primary trabeculectomy.
• To identify potential risk factors for bleb failure.

Main Methods:

• Retrospective review of 88 primary trabeculectomies.
• Follow-up duration of 1 to 5 years (mean 3 years).
• Correlation of biomicroscopic bleb findings with IOP and tonographic values.

Main Results:

• 74% of eyes achieved IOP <= 21 mm Hg without medication.
• Diffuse blebs (42%) showed lower IOP, higher medication-free rates, and better tonographic C values compared to flap-sized (50%) or absent blebs (8%).
• Early hypotony and bleb failure were more common in eyes with flap-sized blebs; younger patients had higher bleb failure rates.

Conclusions:

• Diffuse filtering blebs are associated with superior IOP control and function post-trabeculectomy.
• Bleb morphology significantly impacts surgical success.
• Younger age and specific bleb characteristics may indicate increased risk for failure.