Cornea (Wills Eye Institute Atlas Series)

Pellucid Marginal Degeneration 115

A

B

FIGURE 4-2. Pellucid marginal degeneration corneal topography. A. Significant irregular nasal and tempo ral corneal steepening is apparent in the computed corneal topographic analysis of an eye with moderate pellucid marginal degeneration. Classically, the steepening is seen to curve around inferiorly in this condition. As seen on the color scale on the left, the red colors indicate corneal steepening, and blue colors indicate corneal flattening. The figure on the right shows Placido rings; this image is important to verify the quality and centration of the study. Note the severe distortion of the Placido rings in this eye, with pellucid marginal degeneration. Pellucid marginal degeneration. B. Side view demonstrating corneal protrusion inferiorly with significant steepening near the limbus.

Copyright © 2024 Wolters Kluwer, Inc. Unauthorized reproduction of the content is prohibited.