Clinical analysis of ocular siderosis]

To study the clinical characteristics of ocular siderosis and discuss the way for treatment.Sixty-four patients (64 eyes) with ocular siderosis treated in Ophthalmic Center of Zhongshan University from January 2002 to December 2006 were retrospectively analyzed.The intraocular foreign body (IOFB) was found in 56 cases, with maximum length < or = 2.0 mm in 33 cases; 26 eyes with foreign body located on pars plane or near the ora serrate. The positive rate of foreign body was 76.56% by orbital posteroanterior and lateral radiogram combined with Belot's radiogram and 47.62% by ultrasound biomicroscope (UBM). The occurrence rate of iron deposits in the epithelial cells of the anterior capsule was 100%, secondary glaucoma was 7.69% and retina detachment was 13.84% respectively. Electroretinogram (ERG) was abnormal in 10 case, 7 cases with stage III and 3 cases with stage IV. The intraocular foreign body extraction was done in 56 cases and the success rate was 100%. The magnetism of the intraocular foreign body disappeared in 16.07% of the cases.The intraocular foreign body < or = 2.0 mm was most frequently found in ocular siderosis and mainly located on pars plane or near the ora serrate. Orbital radiogram has advantage to diagnose the intraocular foreign bodies, and UBM can be used as an assistant image-related approach for checking the intraocular foreign body on the anterior segment. Most cases were in Stage III and IV by ERG. Vitrectomy is the most effective approach to remove the intraocular foreign bodies.