PMC3225460_01
Patient's preoperative Orbscan II  corneal topography imaging information.
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The central and thinnest pachymetric readings were 358 mum and 269 mum, respectively, with a reverse keratectasia pattern ( Figure 1).
(A) Intraoperative image of intrastromal channel creation with femtosecond laser; inferior half of the cone was covered by a gelatinous paper. (B) Postoperative first-month slit-lamp image of the cornea showing the inferiorly thin and vascularized cornea and temporal and nasal placement of the intracorneal ring segments.
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In this way, a C-shaped intrastromal channel with an inferior opening was created instead of a full circle (Figure 2A). Slit-lamp examination revealed well-centered intracorneal rings with no migration or inflammatory reaction (Figure 2B).
Patient's postoperative Orbscan II  corneal topography imaging information.
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In Orbscan II  topography, minimum and maximum simulated K readings were 42.3 D and 38.5 D, respectively (Figure 3).