[Delayed discovery of a metallic intraocular foreign body: diagnostic and therapeutic stakes].

Ocular siderosis is a serious and rare complication when a penetrating ocular injury with a metallic foreign body goes unnoticed. The foreign body must be urgently removed from the eye. If it is located on the ciliary body or the zonule, it may be difficult to visualize clinically. In this case, high-frequency ultrasound biomicroscopy can pinpoint its precise location and guide the surgical intervention.