Ординатура / Офтальмология / Английские материалы / Step by Step Reading Pentacam Topography (Basics and Case Study Series)_Sinjab_2010

178 Step by Step Reading Pentacam Topography

Discussion

This is a keratoconus case. The patient is 21-year-old male complaining of progressive reduction of visual acuity in both eyes. His eye examination and family history raised the suspicion of keratoconus. On doing corneal topography, the diagnosis was established.

In the four refractive maps, you can notice the abnormal cornea. The corneal thickness map has a cone-like appearance because of the thinnest location displacement; there is also a very big superior-inferior difference (77 µ). The sagittal curvature front map has AB/IS pattern, but there is no skew in axes. There is a big cone on both elevation maps, more obvious on the posterior map, which is consistent with the abnormal KPD map. The cornea is very prolate as shown on the topometric map with more than 0.3 difference between vertical and horizontal averages. The keratoconus indices page establishes the diagnosis, all parameters are abnormal (the curve lines, the average and the indices). This case is keratoconus level three according to Amsler classification.

Case Study 179

CASE 8: KERATOCONUS POSSIBLE

This is a keratoconus possible case. As in the previous case, I will present the topography and you will try yourself to read 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. 5.8A).

2.The sagittal curvature front map of the right eye (Fig. 5.8B).

3.The sagittal curvature front map of the right eye with the major axes projected (Fig. 5.8C).

4.The elevation front map of the right eye (Fig. 5.8D).

5.The elevation back map of the right eye (Fig. 5.8E).

6.The Topometric map of the right eye (Fig. 5.8F).

7.The keratoconus indices page of the right eye (Fig. 5.8G).

8.The four refractive maps of the left eye (Fig. 5.8H).