Imaging of trabeculectomy blebs using anterior segment optical coherence tomography

Area of Science:

• Ophthalmology
• Medical Imaging
• Glaucoma Surgery

Background:

• Trabeculectomy is a common surgical procedure to manage glaucoma.
• Assessing the success of trabeculectomy relies on evaluating the morphology and function of the filtering bleb.
• Traditional methods for bleb assessment have limitations in visualizing fine structural details.

Purpose of the Study:

• To evaluate the utility of anterior segment optical coherence tomography (AS-OCT) for imaging trabeculectomy blebs.
• To correlate AS-OCT findings with clinical success of trabeculectomy.

Main Methods:

• A prospective cross-sectional study involving 55 patients who underwent trabeculectomy.
• Blebs were imaged using a prototype AS-OCT device and standard color monophotographs.
• Qualitative features assessed included bleb height, wall thickness, cystic spaces, scleral flap apposition, and ostium patency.

Main Results:

• AS-OCT successfully imaged 78 blebs, identifying features like bleb height, cavity, wall thickness, and ostium patency.
• Successful blebs typically showed a thickened bleb wall, while failed blebs were often low with ostial occlusion or flap apposition issues.
• A high success rate (73.1%) was observed, with AS-OCT providing detailed morphological insights.

Conclusions:

• Anterior segment optical coherence tomography (AS-OCT) is a valuable and promising tool for imaging trabeculectomy blebs.
• AS-OCT visualizes detailed bleb morphology, including features not discernible with slit-lamp examination.
• This imaging modality aids in understanding bleb behavior and predicting surgical outcomes.