Tube obstruction caused by intraocular lens capture following PreserFlo MicroShunt implantation

Purpose: We describe a rare case of tube obstruction caused by intraocular lens (IOL) capture following a PreserFlo MicroShunt (PMS) surgery and its subsequent management. Observations: Tube obstruction was noted following PMS implantation at 8 days postoperatively. The intraocular pressure (IOP) increased to 42 mmHg because of tube occlusion that was caused by iris and IOL capture at the tip of the tube. The occlusion was released surgically to free the lumen, and the IOP rapidly decreased to 14 mmHg. Conclusions and importance: IOP elevation due to tube obstruction caused by iris and IOL capture after PMS surgery was resolved by surgical intervention without tube reinsertion. Extra care is required regarding the IOL position in relation to the PMS tube when hypotony occurs in the early postoperative period.