Jacob reports a case in which a chip of iron remained in the eyeball twenty-eight years without giving indications for removal.
It was clearly visible, protruding into the anterior surface of the iris, and although it was rusted by its long lodgment, sight in the eye was fairly good, and there was no sign of irritation.
Snell gives an instance in which a piece of steel was imbedded close to the optic disc with retention of sight.

It was plainly visible by the opthalmoscope eighteen months after the accident, when as yet no diminution of sight was apparent.

Smyly speaks of a portion of a tobacco pipe which was successfully removed from the anterior chamber by an incision through the cornea.

Clark mentions a case in which molten lead in the eye caused no permanent injury; and there are several cases mentioned in confirmation of the statement that the eye seems to be remarkably free from disastrous effects after this injury.
Williamson mentions eyelashes in the anterior chamber of the eye, the result of a stab wound of this organ.
Contusion of the eyeball may cause dislocation of the lens into the anterior chamber, and several instances have been recorded.

We regret our inability to give the reference or authority for a report that we have seen, stating that by one kick of a horse the lenses of both eyes of a man were synchronously knocked through the eyeballs by the calkins of the horseshoe.