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Intraocular metallic foreign body causing branch retinal vein occlusion. We report a case of a 40-year-old man with post-traumatic cataract and an intraocular metallic foreign body (IOFB) lying on the retinal surface causing a superotemporal branch retinal vein occlusion. The case was managed using lens aspiration with pars plana vitrectomy and IOFB removal. We only found two previous reports of such a foreign body causing a vascular occlusion. The possibility of a vascular occlusion occurring due to a foreign body within or close to the optic disc is highlighted.