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摘出眼内异物手术前将定位环缝合在眼球上,然后摄X片。由于患者眼球自觉或不自觉地转动,定位环也随之产生偏斜,致使异物在正,侧位片中的像点位置不是异物再以Fick轴建立的三维空间直角坐标系中真正的像点位置。由于异物像点的变位,使手术者很难根据异物在正、侧位X片中的变位像点P’正变、P’侧变,对异物点准确定位和选择手术最佳切口。
Removal of intraocular foreign body suture before positioning the ring in the eye, and then take X-ray film. As the patient’s eye movement consciously or unconsciously, the positioning ring will also be skewed, resulting in foreign body in the positive and lateral position of the film is not a foreign body and then Fick axis to establish the three-dimensional rectangular Cartesian coordinates of the real point position. Due to the displacement of the image point of the foreign body, it is difficult for the surgeon to accurately locate the foreign body point and select the optimal surgical incision according to the displacement point P ’of the foreign body in the positive and lateral X-rays and the change of the P’ side.