Ultrasound biomicroscopy of filtration blebs
Aim: To assess the internal anatomy of filtering blebs in vivo.
Materials and methods: We performed high-resolution, high-frequency ultrasound biomicroscopy on filtration blebs with a range of clinical appearances to evaluate the internal ostium, scleral flap, and subconjunctival space in eachtype ofbleb.
Results: Diffuse, spongy, thin-walled and cystic, encapsulated, and failed blebs were successfully imaged without morbidity. The pattern of subconjunctival aqueous flow was assessed and sites of blockage to flow determined.
Conclusion: Improved knowledge of the internal structure of filtration blebs should allow us to recognize earlier stages of bleb failure and characteristics of nonfunctional blebs with the intent of manipulating bleb structure to establish or improve function.
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