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R. Leal Rodriguez, Sr., O. Albis Donado, Sr., F. Gil Carrasco, Sr.; Induced Keratometrical Change After Phacoemulsification Cataract Surgery Combined With Trabeculectomy or Ahmed Valve. Invest. Ophthalmol. Vis. Sci. 2010;51(13):4453.
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To assess the surgical induced astigmatism (SIA) in glaucoma patients at 6 and 12 months after phacoemulsification combined with trabeculectomy or Ahmed Valve
We conducted a study where 203 eyes from 163 patients were studied retrospectively. One hundred fifty nine eyes underwent phacoemulsification plus trabeculectomy (group 1), 44 patients underwent phacoemulsification plus Ahmed Valve (group 2). Keratometrical readings before surgery and at 6 and 12 months were recorded. SIA was analyzed using both arithmetic and vector analysis methods, statistical differences were compared using student's T and ANOVA
Basal mean astigmatism was 1.0 and 1.06 for group 1 and 2 respectively. SIA analyzed by arithmetic method was 1.5 D and 0.9 D at 6 and 12 months for group 1, and 2 D and 1.5 D at 6 and 12 months for group 2. We found a significant difference in SIA between 4 and 12 months in group 1 (p=0.003) but we didn't find significant difference in SIA between 4 and 12 months in group 2 (p=0.663). The SIA decreased at 12 months for group 1 but remained larger than basal at 12 months for group 2. Comparing SIA between groups we found significant difference at 12 months (p=0.002) SIA analyzed by the vector method did not show statistical difference between both groups
Even though there is a statistical difference in arithmetic keratometric analyze between groups, the vector analysis shows no statistical difference
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