Cornea (Wills Eye Institute Atlas Series)

106 4 Ectatic Conditions of the Cornea

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FIGURE 4-1. ( continued ) Keratoconus E. Anterior segment optical coherence tomography pachymetry map of an eye with keratoconus. The color image on the left depicts the total corneal thickness displaying a thinner-than normal cornea with slight inferior decentration of the thinnest point, which is typical of keratoconus. The color image on the right is just the epithelial thickness demonstrating a relatively thin epithelium centrally with a thick ened epithelium in the midperiphery, the so-called “doughnut effect.” F. Slit-beam view of an eye with significant keratoconus demonstrating inferocentral corneal thinning and steepening. Note the thinnest and most protruded areas of cornea coincide.