The placido-disk topography systems are based on the reflection principle. A placido disk is projected onto the cornea and the images of the placido disk reflected off the cornea are captured ...

Figure 1. OPD-Scan III of the axial topography of the left eye showing regular central astigmatism with distortion of the placido ring. Source: Lisa K. Feulner, MD, PhD Figure 2.

We read the article “Topography-guided ablation may offer benefits after laser vision correction” published on Healio and share Dr. Pineda’s enthusiasm for the benefits of this technology ...