Clinic experience of magnetic intraocular foreign body extracted by algesthesis localization method Objective To investigate the practicable of extracting magnetic intraocular foreign body with electromagnet via incision of cataract surgery. 痛觉定位法球内磁性异物取出手术体会目的探讨经白内障切口钓鱼法摘出玻璃体腔磁性异物的方法。