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Table 1 Definition of the groups investigated in this study

From: Impact of keratoconus stage on outcome after corneal crosslinking

Stage Kmax Morphological characteristics
Group I <  48 dpt Vogt’s striae, no corneal scars, corneal thickness ≥ 400 μm
Group II 48–53 dpt No central scars, corneal thickness ≥ 400 μm
Group III >  53 dpt No central scars, corneal thickness ≥ 400 μm
  1. Modified Krumeich classification system of keratoconus stages defined by the presented parameters