Traumatic cataract is a clinical condition in which the lens becomes rusty. 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 warriors. What are the examination methods of iron deposition in the lens? 1.Focal illumination examination method Direct illumination with light to see if there is clouding and dislocation of the crystal. 2.Iris projection method With a fine light projected obliquely at 45 degrees from the pupil margin to the crystal, if the crystal is cloudy in the core, there is a crescent-shaped transparent area between the cloudy area and the pupil margin, the heavier the cloudiness the narrower the shadow. If the crystal is completely cloudy, the crescent-shaped shadow disappears completely. If the crystal or refractive interstitium is cloudy, a black spot or a black lump in the red shadow will be visible. During the examination, the patient can turn the eye to see whether the black shadow moves or not to understand the location of the clouding. 4.slit lamp examination method The slit lamp for optical section examination, from front to back, can be seen many light and dark hierarchical structures, representing the lens nucleus at different times, the transparency of each level is not completely consistent, of which the front capsule, the front surface of the adult nucleus and the post-embryonic surface is clearer. When emergency surgery is required, preoperative routine blood tests such as routine blood count, PT, APTT, and blood biochemistry are required. In cases of complex ocular trauma, ultrasound, X-ray and CT are needed to clarify intra-ocular destruction in the early stages of the disease when the refractive interstitial involvement cannot be visualized. In cases where a foreign body is present, localization and removal of the foreign body is required. In the late stage of trauma, after the intraocular condition is stabilized, corneal endothelial cell count, electroretinography (ERG) and visual evoked potential (VEP) are routinely performed as per preoperative cataract surgery to predict the postoperative visual acuity.