Eye injuries and their treatment . angle support is a lamp so arranged as to throw a beamof light on this mirror. There is also a graduated scale fixed to a standwhich can be moved from place to place. When the instrument is to be used the tube is adjusted by the mov-able screws so that the needle and mirror swing freely, with the northpole of the magnet pointing to the north, and the mirror reflects thelight on to the graduated scale which is placed at a distance of 2 or 2jmetres. The patient is then seated on a chair with the affected eye asnear as possible to the magnetic needle. Should a c
Eye injuries and their treatment . angle support is a lamp so arranged as to throw a beamof light on this mirror. There is also a graduated scale fixed to a standwhich can be moved from place to place. When the instrument is to be used the tube is adjusted by the mov-able screws so that the needle and mirror swing freely, with the northpole of the magnet pointing to the north, and the mirror reflects thelight on to the graduated scale which is placed at a distance of 2 or 2jmetres. The patient is then seated on a chair with the affected eye asnear as possible to the magnetic needle. Should a chip of iron or steelbe present the needle will move and the spot of light will travel alongthe scale. The size of the splinter may be determined by the extent of thedeviation—the greater the swing, the larger will the foreign body be ; whileits position is got in like manner by bringing different portions of the eyenear to the needle—the foreign body is nearest when the beam of lightrecords the maximum of movement. PLATE PENETRATING WOUNDS 83 produce but little disturbance. Leber has shown thatcopper is particularly dangerous, even when it is quitefree from micro-organisms, for it always sets updestructive inflammation as a result of chemical account of the accident, the position and characterof the wound, and the subsequent history of the case,may all afford strong presumptive evidence that theeye contains something extraneous, but this suspicioncan be confirmed only by actual demonstration of thepresence of a foreign body. If the media be trans-parent the substance may be seen either by the nakedeye or by means of the ophthalmoscope, but careshould always be taken not to mistake a small blood-clot, or a minute rent in the iris, for a particle ofmetal. In many instances, however, the media arenot transparent at the time the patient seeks the intruder be a chip of iron or steel its presencemay be determined by aid of Hirschbergs sideroscope(Plat
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