Ординатура / Офтальмология / Английские материалы / Step by Step Reading Pentacam Topography (Basics and Case Study Series)_Sinjab_2010
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Case Study 181 
Fig. 5.8B: The sagittal curvature front map of the right eye.
182 Step by Step Reading Pentacam Topography
Fig. 5.8C: The sagittal curvature front map of the right eye with the major axes projected.
Case Study 183 
Fig. 5.8D: The elevation front map of the right eye.
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Fig. 5.8E: The elevation back map of the right eye.
Case Study 185 
Fig. 5.8F: The Topometric map of the right eye.
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Fig. 5.8G: The keratoconus indices page of the right eye.
Case Study 187 
Fig. 5.8H: The four refractive maps of the left eye.
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Discussion
According to Amsler classification, this is a keratoconus possible case. The possibility came from: the pattern of the sagittal curvature front map. As you see, other parameters are within the accepted range.
The sagittal curvature front map has two patterns: AB/ IS and the vortex pattern, although there is no skew in the very central major axes. The posterior elevation map is irregular in spite of its normal values. There are two indices in the keratoconus indices page with abnormal values, the ABR and the IHD. The ABR stands for Aberration Coefficient. The IHD stands for Index of Height Decentration; it indicates the degree of decentration of the elevations in vertical direction, elevated in keratoconus.
That was for the right cornea, but looking to the left corneal topography reveals the diagnosis of left eye keratoconus, hence, the need to see the topography of both eyes.
Case Study 189 
CASE 9: ABNORMAL CORNEA
This case is very strange, the right cornea is normal while the left cornea is abnormal, but still the diagnosis is neither keratoconus nor keratoconus possible. As in the previous cases, I will present the topography of the case and you will try yourself reading each map, writing notes and discussing the case depending on the skills you have learned, then you can read the discussion.
1.The four refractive maps of the right eye (Fig. 5.9A).
2.The four refractive maps of the left eye (Fig. 5.9B).
3.The corneal thickness map of the left eye (Fig. 5.9C).
4.The sagittal curvature front map of the left eye (Fig. 5.9D).
5.The elevation front map of the left eye (Fig. 5.9E).
6.The elevation back map of the left eye (Fig. 5.9F).
7.The Keratometric power deviation map of the left eye (Fig. 5.9G).
8.The Topometric map of the left eye (Fig. 5.9H).
9.The keratoconus indices page of the left eye (Fig. 5.9I).
10.Two difference thickness maps (Fig. 5.9J).
11.Two difference Topometric maps (Fig. 5.9K).
12.Two difference keratoconus indices pages (Fig. 5.9L).
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Fig. 5.9A: The four refractive maps of the right eye.