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20.1 Case 1: Cylinder overcorrection from measurement of
keratometric astigmatism in an eye with WTRA
A 51-year-old woman underwent cataract extraction in OD. Her refraction was sph +4.00
cyl +0.75 A 100°. Axial length was 20.03 mm, and a +33.00 D toric Acrysof (Alcon, Fort Worth, TX)
was calculated for emmetropia. The Pentacam® detected a WTRA whose measurements at 3 mm
(Figure 170, Figure 171) yielded a 0.8 D difference between KA (1.4 D 110.8°) and TCRP astigmatism,
i.e. TCA (0.6 D 14.9°).
Figure 170: 1 Large Color Map showing keratometric astigmatism with a difference
between K1 and K2 of 1.4 D 110.8°
20 Total corneal astigmatism for toric IOL
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