| 摘要 |
In one embodiment two right-angular intersecting radiopaque wires are secured to one leg of a transparent, right-angular frame, which is adapted to be mounted by an operator on the up-turned face of a supine patient, so that the intersection of the wires registers with the axis of the pupil of the injured eye. The other leg of the frame carries an arcuate wire, which the operator aligns with the foremost arc of this pupil, and a fourth wire spaced rearwardly of the arcuate wire and disposed to extend at right angles of the pupil axis. Vertical and cross table X-rays are then taken to provide two roentgenograms on which images of the wires and the foreign body in the eye are superimposed. By measuring the offset of the foreign body images from, respectively, the images of the two intersecting wires, and the image of the fourth wire, the operator can determine mathematically if the body lies within the optic globe of the eye, in which case it would have to be removed.
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