Anterior Segment Optical Coherence Tomography (AS-OCT) 3D Observation of PreserFlo MicroShunt

A 74-year-old Japanese woman with a history of primary open-angle glaucoma (POAG) in both eyes underwent PreserFlo MicroShunt (PFM) (Osaka, Japan: Santen Pharmaceutical, Co., Ltd.) implantation two years prior. Despite slit-lamp examination and standard anterior segment optical coherence tomography (AS-OCT) evaluations, the detailed condition of the stents was unclear. By using raster scanning and three-dimensional (3D) AS-OCT imaging, stent deformation and displacement were clearly identified, including a C-shaped deformation in the right eye. This type of deformation has rarely been reported and may result from compression by surrounding scar tissue. AS-OCT is widely known to be useful in perioperative evaluation of PFM, but our experience suggests that the addition of 3D imaging significantly enhances its utility in assessing the precise condition of the stent postoperatively. In this case, we were able to gain valuable insights into the stent placement, which may aid in future perioperative management of PFM complications.