Anterior Segment Optical Coherence Tomography Imaging of Conjunctival Filtering Blebs after Glaucoma Surgery
Figure 5
Filtering bleb features after Ex-PRESS implantation according to the position of the device. Bleb morphology may be significantly affected by the position of the device within the scleral bed. In anteriorly positioned Ex-PRESS implant (a) (0-1 mm from the limbal margin (L); arrowhead), the bleb presents features of a failed filtration, with a flat shape (asterisk), limited subconjunctival area (scattered cysts), and a hyperreflective bleb wall. Conversely, in posteriorly positioned Ex-PRESS implant (b) (1 to 2-3 mm from the limbal margin (L); arrowhead), the bleb presents features of an effective filtration, with a cystic multilobed shape (asterisk), a wide subconjunctival filtration area, and a low reflective bleb wall (RTVue, Optovue, Inc, CA).
