Iron is the most common intraocular foreign body, the foreign body in the lens can form a limited cataract, if the iron foreign body is small, it can exist in the crystal for many years without obvious reaction, iron can oxidize in the eye and gradually spread in the eye, forming ocular rust deposits, including rust deposits in the cornea, iris, lens, and retina, eventually leading to blindness, the rust deposits in the eye are related to the size and location of the intraocular foreign body. Larger and posterior foreign bodies tend to migrate to the posterior segment of the eye. Lens rust deposition is a clinical symptom of traumatic cataract. Direct or indirect mechanical injury to the lens can produce cloudy changes, called traumatic cataract. Patients are most often seen in children, young adult males and soldiers. How to effectively prevent iron deposition in the lens? I. Western medical treatment 1. When the limited clouding of the lens has little effect on vision, it can be observed and no special treatment is needed. 2.When corneal laceration and lens capsule rupture and crystal cortex filled anterior chamber exist at the same time, debridement and suturing and cataract aspiration can be completed at the same time. 3.When there is inflammatory reaction to ocular trauma, hormones and other drugs should be applied; after the inflammatory reaction to trauma is reduced or subsided, surgery should be performed. If the inflammation cannot be controlled or the intraocular pressure continues to rise, cataract surgery should be performed in time. 4. When the lens is completely cloudy, if the light perception and color vision are normal and there are no other complications, surgery should be performed in time to remove the cataract. 5. When treating traumatic cataract, artificial lens should be implanted as much as possible. II. Prognosis Traumatic cataract should be prevented, starting with children, who should be taught not to play with sharp objects, not to play with toys that can easily cause eye injury, and not to set off fireworks to avoid eye trauma. In case of eye trauma, they should be brought to the hospital in time. Adults in the work and life at all times pay attention to eye protection, machinery workers, treatment and refining workers should pay attention to the safety of the operation, wearing protective glasses, to avoid various mechanical eye injuries and radioactive damage. Long-term contact or engaged in microwave work of technical personnel, should wear anti-microwave glasses.