Topography maps were obtained by using Placido-disk corneal topography. Pentacam/Corvis ST ARV (OCULUS Optikgeräte, Wetzlar, Germany) (Ambrósio, Roberts, and Vinciguerra) TBI display was obtained for the 23 normal control eyes of the very asymmetric ectasia group. Topography map with keratoconus screening indices (left) and Pentacam/Corvis ST ARV TBI display (right) from each patient are shown for 12 of the 23 cases.
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