Bleb needling in encapsulated filtering blebs: evaluation by optical coherence tomography.

Area of Science:

• Ophthalmology
• Glaucoma Surgery
• Medical Imaging

Background:

• Encapsulated filtering blebs can complicate glaucoma surgery outcomes.
• Bleb needling with 5-fluorouracil (5-FU) is a common intervention.
• Assessing bleb morphology is crucial for predicting surgical success.

Purpose of the Study:

• To determine the utility of anterior segment optical coherence tomography (OCT) in characterizing encapsulated filtering blebs.
• To evaluate the role of OCT in predicting outcomes after bleb needling.

Main Methods:

• Prospective study of 9 patients undergoing bleb needling with 5-FU.
• Slit-lamp examination, Goldmann tonometry, and OCT were performed pre-procedure, 2 days post-procedure, and 6 months post-procedure.
• OCT was used to measure internal cyst height and describe bleb morphology.

Main Results:

• Pre-needling average cyst height was 1.3 mm; post-needling, it decreased to 0.7 mm at 6 months.
• A cyst collapse was observed in 5 patients by day 2 post-needling.
• Patients with a collapsed cyst at day 2 achieved controlled intraocular pressure (IOP) without medication.

Conclusions:

• The preoperative cyst height did not correlate with the needling outcome.
• Early cyst collapse (day 2) is a positive indicator for IOP control.
• Persistent prominent cysts at 6 months suggest suboptimal bleb function.