We present a 63-year-old man who developed low-grade endophthalmitis 6 months after phacoemulsification and implantation of a foldable posterior chamber intraocular lens (IOL). The capsular bag was distended, but shallowing of the anterior chamber was not observed. Chemical analysis of the clear fluid aspirated from the capsular bag behind the IOL revealed the presence of an ophthalmic viscosurgical device.