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14.1.4 Keratoconus
Press the
“AK”
button to open Keratoconus screening; this section is divided into two tabs: KC and CLMI.
The KC shows the following information (Fig. 32):
Fig. 32

AK : Apical curvature
Represents the power of the cornea at its apex

AGC : apical gradient of curvature
Represents the average variations per unit of length of the corneal power, taking the apical power as a
reference.

SI
: the difference between the average power of two circular zones centered on the vertical axis
of the ruler and placed in the lower hemisphere and the upper hemisphere of the cornea,
respectively.

Kpi : Keratoconus diagnosis probability index.
Based on the combined evaluation of the first three indexes with the probability index, three different
possibilities result: topographic picture not compatible with keratoconus (green); suspected keratoconus
(yellow); topographic picture compatible with keratoconus (red).
If the topographic picture is compatible with keratoconus or indicates suspected keratoconus, the numerical
values of the geometric parameters of the cone are shown at the bottom of the panel. These are: