Filtering blebs using 3-dimensional anterior-segment optical coherence tomography: a prospective investigation

Area of Science:

• Ophthalmology
• Glaucoma Surgery
• Medical Imaging

Background:

• Post-trabeculectomy filtering bleb changes are not well understood.
• These changes may impact intraocular pressure (IOP) control.
• 3-dimensional (3-D) anterior-segment optical coherence tomography (OCT) offers detailed bleb imaging.

Purpose of the Study:

• To evaluate time-dependent changes in filtering bleb parameters after trabeculectomy.
• To assess the relationship between bleb morphology and IOP control.
• To investigate the role of aqueous cytokines in bleb formation.

Main Methods:

• Prospective observational study at Kumamoto University Hospital.
• Inclusion of 29 eyes with open-angle glaucoma undergoing trabeculectomy.
• 3-D anterior-segment OCT used to measure bleb parameters over 12 months.

Main Results:

• Significant changes in bleb parameters observed, including increased height and wall thickness, and decreased filtration opening width.
• Filtration openings showed a tendency to close over time.
• Early filtration opening width (at 0.5 months) correlated with 12-month IOP.
• Monocyte chemoattractant protein-1 levels correlated with filtration opening width.

Conclusions:

• Early filtration opening width after trabeculectomy is a potential prognostic factor for long-term IOP control.
• 3-D anterior-segment OCT is valuable for monitoring bleb changes.
• Further large-scale studies with longer follow-up are recommended.