About Ectasic Area Distribution Type:

    This software requires information on how the ectasic area is distributed in the cornea. For that, we use the steepest meridian indicated in the topography ("Sim K" of the axial map) as reference to split the cornea into two hemispheres. Then, we observe if the ectasic area is equally distributed in both hemispheres or is concentrated in just one.

    The best way to analyse the keratoconus morphology and it's distribution in relation to the steepest corneal meridian, is to use the "Normalized Scale".  

This way, we created the following classification:

Distribution type 1: the whole ectasic area is limited to one corneal hemisphere

 Distribution type 2: Almost the totality of the ectasia (75%) is in one hemisphere and a small portion is placed in the other.

 Distribution type 3: 2/3 of the ectasic area is in one corneal hemisphere and 1/3 is in the other.

 Distribution type 4: The steepest meridian of the cornea splits the ectasic area in the half.