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5 Differences between Placido and
elevation-derived curvature maps
by Prof. Michael W. Belin
5.1 Keratoconus in OD and OS?
The case shown below explains the difference between suspicious and significant elevation maps
and numbers. The topographic map (Figure 8) shows the left and right eye but gives no unequivocal
statement if it is a keratoconus or not.
The right eye seems to be fine. The left eye is a little steeper. The Pentacam® 4 Maps Selectable
answers clearly the question.
Figure 8: Placido based topography of OD and OS allowing no conclusion regarding
keratoconus
5 Differences between Placido and
elevation-derived curvature maps
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