Fig. 3

Ultrasound biomicroscopy (UBM) and optical coherence tomography (OCT) examination of a filtering bleb invading the cornea. A: UBM shows that the tissue on the corneal surface is a cystic structure, and the inner wall is hyperechoic. The corneal epithelial structure has disappeared, and the boundary between the inner wall of the filtering bleb and the cornea is unclear (white arrow). B: The echo intensity in the filtering bleb varies, with a few liquid dark areas (yellow arrow). The filtering bleb at the corneal limbus is partially unobstructed, with a liquid hypoecho in it, and the incision in the root of the iris can be seen (white arrow). C: OCT shows that the light reflection band of the corneal epithelium not covered by the filtering bleb is clear (yellow arrows). The corneal epithelial structure in the area covered by the filtering bleb has disappeared, and the cornea has fused with the filtering bleb (white arrow)