60
The left eye shows a major posterior ectasia (+ 91 μm) on inferior island, and marked inferior
displacement of the pachymetry map (thinnest reading 414 μm) (Figure 71). The anterior elevation
shows a somewhat irregular astigmatic pattern but without any obvious positive island. The
tangential curvature incorrectly locates the cone much more inferiorly than the cone location
shown by both the posterior elevation data and the pachymetry map.
DIAGNOSIS - normal astigmatic eye
Figure 71: 4 Maps Selectable showing an asymmetric cornea with keratoconus in OS
10 Screening for refractive surgery
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