87
The enhanced reference surface more closely resembles the more normal periphery (Figure 108) and
allows for easier identification of ectatic regions.
In Figure 109, the standard BFS is shown on the left, while the enhanced reference surface on the
right accentuates the ectatic region, yielding an island of greater magnitude.
The enhanced reference surface is one component of the Belin/Ambrósio Enhanced Ectasia Display,
a comprehensive tool for preoperative refractive surgery screening.
Figure 107: Elevation map of a keratoconic cornea using an enhanced reference shape
with an exclusion zone to improve detectability
Figure 109: Standard BFS on the left, enhanced reference surface on the right
Figure 108: Enhanced reference surface
12 Belin/Ambrósio Enhanced Ectasia Display
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