Screening Parameters By Prof. Renato Ambrósio Jr - OCULUS Pentacam Interpretation Manual

11.5 Screening parameters
by Prof. Renato Ambrósio Jr
From my experience the following parameters can be used for screening corneal thickness profiles. It
is very important to look out for blinking or significant fixation loss during the scan and repeat the
exam whenever necessary. These parameters can be used as a guideline, but the clinician should also
consider other clinical parameters of the Pentacam® and clinical diagnostics.
Average pachymetry progression index
0.5 < average pachymetry progression index < 0.8: Fuchs' dystrophy or oedema
„ „
0.8 < average pachymetry progression index < 1.2: normal or ocular hypertension
„ „
average pachymetry progression index > 1.2: ectasia
„ „
The shapes of the curves of the thickness profile and percentage of thickness increase give additional
information:
flat curve: may be a normal cornea, but watch out for endothelial disease Fuchs´ dystrophy or
„ „
guttae
steep curve: ectasia or ectasia susceptibility
„ „
flattening in the periphery only: ocular hypertension
„ „
In this way the course of the CTSP and PIT curves and the average pachymetry progression index all
provide additional information for making clinical decisions.
11 Corneal Thickness
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