Intermittent pupillary capture of an intraocular lens (IOL) is an early complication of sclera-fixated sutured posterior chamber IOL implantation. In the few published cases of this complication, vitrectomy was performed with a scleral-fixated sutured IOL. The cases are related toMarfan syndrome, pseudoexfoliation syndrome, lens subluxation, and unknown causes. The proposed mechanism in cases with a well-positioned scleral-fixated sutured IOL is posterior iris bowing that pushes the IOL until pupillary capture occurs. To our knowledge, eyes with this complication and primary pigment dispersion syndrome (PDS) have not been reported. We describe a case of intermittent pupillary capture of an IOL secondary to primary PDS in which iris transillumination of the contralateral eye clarified the cause of the IOL pupillary capture.