Ординатура / Офтальмология / Английские материалы / Step by Step Reading Pentacam Topography (Basics and Case Study Series)_Sinjab_2010
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Case Study 131 
Fig. 5.5J: The four refractive maps of the right eye. The sagittal curvature map has a clear irregular pattern oriented as with-the-rule astigmatism. The posterior elevation map shows abnormal numbers. There is nothing suspicious in the thickness map in general but seems a little bit irregular. The quality of the capture (QS) is OK.
132 Step by Step Reading Pentacam Topography
Fig. 5.5K: Corneal thickness map. The shape of this map is slightly irregular with a horizontal displacement of the thinnest location.
Case Study 133 
Fig.5.5L:Thesagittalcurvaturefrontmap.Asymmetricbowtie/superior steep (AB/SS), which means a superior hot spot. The superior-inferior difference is abnormal. High K-readings in the hot spot.
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Fig. 5.5M: The elevation front map. Irregular shape with tongue-like extension.
Case Study 135 
Fig. 5.5N: The elevation back map. Irregular shape with abnormal values within the central 4 mm circle, the difference between anterior and posterior values is >+5 µ in some points.
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Fig. 5.5O: The Keratometric power deviation map. It is highly irregular with abnormal values in the center.
Case Study 137 
Fig. 5.5P: The Topometric map: there is high difference between horizontal and vertical values in general, and between the four meridians (yellow arrows). This indicates corneal irregularity, which increases towards the periphery (red arrows).
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Fig. 5.5Q: The keratoconus indices page: the average is abnormal, the diagnosis box displays KK Possible, and most irregularity indices are also abnormal.
Case Study 139 
Fig. 5.5R: Corneal topography of the right eye of the above patient’s sister: she has keratoconus.
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•The keratoconus indices page (Fig. 5.5Q): Although the curve lines are within the normal range, the average is abnormal (1.6). The diagnosis box displays KK Possible, which means probable keratoconus according to Amsler classification. Most irregularity indices are also abnormal.
P.S. Amsler classification is based on clinical signs and anterior curvature map (not elevation based) topography.
As there is abnormality in the right eye corneal topography with Amsler diagnosis of KK Possible, it is highly recommended to capture the patient’s relatives. Fig. 5.5R shows corneal topography of the right eye of the patient’s sister. It is very clear that the cornea is keratoconic.