Topographic devices generally fall into two categories based on their measurement principle:
This guide is based on the principles outlined in by Mazen M. Sinjab . Corneal topography is a non-invasive imaging technique used to map the surface curvature, shape, and power of the cornea. 1. Fundamentals of Topography Systems Corneal Topography in Clinical Practice
: Use a series of concentric black and white rings (Placido discs) reflected off the tear film to map the anterior (front) corneal surface. Topographic devices generally fall into two categories based