Cornea (Wills Eye Institute Atlas Series)

Keratoconus 105

D FIGURE 4-1. ( continued ) C. The Belin/Ambrósio Enhanced Ectasia Display of the eye seen in B demonstrating significantly abnormal anterior and posterior elevations, highly suggestive of keratoconus. The “D value” in the lower right corner of the display is 8.51; above 2.0 is considered abnormal. D. The irregular inferior steepening seen on computed corneal topographic analysis of an eye with keratoconus revealing a slight crab-claw pattern, which is reminiscent of pellucid marginal degeneration. Eyes with “low-sagging cones” can demonstrate this topo graphic pattern.

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