Placido‐based corneal topography and Scheimpflug‐based corneal tomography

A. Langenbucher1, N. Szentmary2,3, L. Daas2, E. Wylegala4, T. Eppig1 1Saarland University, Experimental Ophthalmology, Homburg, Germany, 2Saarland University Medical Center UKS, Department of Ophthalmology, Homburg, Germany, 3Semmelweis University, Department of Ophthalmology, Budapest, Hungary, 4District Railway Hospital Katowice, Department of Ophthalmology, Katowice, Poland Summary: Measuring the curvature of the corneal front surface has a long tradition in ophthalmology. Starting from the Helmholtz keratometer and the hand-held Placido disk, videokeratography and Placido disk based topographers have been developed decades ago. These technologies provide lots of clinically relevant information about integrity or pathology of the anterior corneal surface. In the last decade several tomographers have been developed which work with slit projection technology (e.g. Scheimpflug imaging) and retrieve additional data on cornea thickness and back surface geometry as well as the dimensions of the anterior segment of the eye. This presentation will address the different measurement techniques of topographers and tomographers and their prospects and limitations.