4. Too small a wound being made for its extraction, the metal being wiped off on the edges of the wound as the magnet is withdrawn.
5. Insufficient power in the magnet.
Remote. 1. Panophthalmitis, which must be treated by evisceration.
Fig. 126. Large Electro-magnet. The current is turned on by means of the foot pedal.
2. Irido-cyclitis; if this be prolonged, and keratitis punctata appear, enucleation should be performed.
3. Traumatic cataract; this may subsequently require needling.
4. Detached retina as the result of organization in the vitreous; this may occur months after the original injury.
With the giant magnet. The foreign body should have been previously localized by the X-rays, and its position and size determined, so that it may be removed by the shortest possible route and with the least amount of injury to the eye.