Keratoconus can result in extremely complex and variable topographical maps, most typically showing areas of inferior steepening. The cone can assume various shapes and sizes, and the apex can be at various locations in relation to the central cornea.
Based on severity of curvature
· Mild <48 D in both meridians
· Moderate 45-53 D in both meridians
· Advanced >53 D in both meridians
· Severe >55 D in both meridians
Based on shape of cone
· Small diameter (5 mm.); round shape; easiest to fit with contact lenses
· Large oval diameter (>5 mm.); often displaced inferiorly; more difficult to fit with lenses
· Largest diameter (>6 mm.); 75% of cornea affected; most difficult to fit with lenses
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