The Corneal Topography of Keratoconus

This article is the sixth in a series which describes the role of corneal topography and highlights its value in different clinical settings. It illustrates and describes the variety of topographical patterns seen in keratoconus. The importance of screening for sub-clinical cases prior to refractive keratoplasty and the development of software and statistical indices designed to detect, diagnose and monitor the progression of the disease are discussed. The article illustrates the limitations of placido-disc based systems in obtaining accurate information in severely affected eyes with surface irregularities. The possible clinical applications of videokeratoscopy in the management of keratoconus are reviewed.