SOME CONTRIBUTIONS TO THE ART OF LOCALIZING OCULAR FOREIGN BODIES

Abstract

CONTENTS Meridional Localization : Localization with Respect to Structures of Eye An Improved Chart The Square Root Rule Calculating the Size of a Foreign Body Borderline Localizations Two Scale Plotting Mathematical Localization (Nongraphic) Localization in the Highly Ametropic Eye Application of the Wessely Keratometer Some Modifications of the Vogt (Bone-Free) Method Ophthalmoscopic Localization A Simplified Apparatus A Convenient Drawing Board A Convenient Viewing Box MERIDIONAL LOCALIZATION : LOCALIZATION WITH RESPECT TO STRUCTURES OF EYE When an ocular foreign body is localized from roentgenograms by one of the graphic or mathematical methods, its position is described by giving the horizontal and vertical components of its distance from the optical axis and its horizontal distance from the apex of the cornea. Translated into mathematical terms, the foreign body is localized with reference to a system of rectangular coordinates, the origin of which is at the apex of the cornea. In this system theX