WHENEVER an eye is injured by a foreign body, it immediately becomes of vital importance to determine (1) whether the globe was penetrated by the body, and (2) whether the foreign body remained within the globe or passed through it. The proper management of such injuries depends upon the early and accurate determination of these points. Sometimes examination with the ophthalmoscope will give the necessary information, but usually a penetrating wound of the globe will so cloud the transparent fluids and structures of the eye that ophthalmoscopic examination is not satisfactory. Therefore, following the discovery of the X-ray, the advantages of determining the presence of a foreign body by radiography, and its accurate localization, were quickly recognized, and the work in this field was one of the earliest developments in clinical radiology. The first recorded localization of a foreign body in the eye is said to have been the one made by Dr. Francis H. Williams and Dr. Charles H. Williams, of Boston, on June 5, 1896, reported by Dr. Charles H. Williams, in the Boston Medical and Surgical Journal of Aug. 13, 1896, the X-ray work being done at the Rogers Laboratory of Physics of the Massachusetts Institute of Technology. Dr. W. M. Sweet, of Philadelphia, reported localization by his method in the Archives of Ophthalmology of November 27, 1898. Dr. Charles F. Bowen, of Columbus, Ohio, also reported his method of localization about the same time. Since the perfection of localization technic, ophthalmologists have been placed in a position of decided advantage in handling foreign body injuries of the eye. The ability to determine definitely the location of the foreign body, its size, shape and, within limits, its nature, permits the proper treatment of such injuries to be given early and has conserved the vision of many eyes which would, otherwise, have been lost. Among the writers on this subject, from the radiologic standpoint, during recent years, may be mentioned the following: John S. Derr, in the American Journal of Roentgenology, August, 1916, emphasized the value of X-ray in determining the presence of foreign bodies and the ability to recognize very small foreign bodies. He described the old Sweet apparatus and reported sixteen cases of localization. James G. Van Zwaluwenburg, in the American Journal of Roentgenology, for October, 1917, emphasized the necessity of fixation of the head and globe, and discussed various sources of error and their avoidance. Ancil Martin and W. W. Watkins, in Southwestern Medicine, for November, 1919, discussed the value of radiography, and the varying density of different substances encountered as foreign bodies, reporting twelve selected cases. M. B. Titterington, in the Journal of Radiology, for January, 1920, described in detail methods with the Sweet-Bowen localizer, and also with the improved Sweet localizer. Emphasis was laid on the necessity for complete fixation of the globe.