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Carolina Prado, Maria Luisa Zavala Aznar, Sandra Karina Silva Romano, Rafael Castaneda Diez; Induced astigmatism in patients undergoing combined surgery of phacoemulsification, intraocular lens implantation and trabeculectomy.. Invest. Ophthalmol. Vis. Sci. 2014;55(13):6120.
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To determine the corneal astigmatism induced in patients after phacoemulsification with intraocular lens implantation and trabeculectomy. Keratometric changes were measured with an automated keratometer, patients were evaluated for a period of one year follow-up.
Observational retrospective study. Changes in keratometry were evaluated at 6 months and 1 year using scalar and vector analysis. All surgeries were performed by the same expert surgeon. In the scalar analysis, astigmatism was calculated as the difference in keratometry measurements in absolute values.
28 patients were included in this study, 24 (84.7%) men and 4 (14.28%) women. The mean age was 75.6 years (±6.8). Preoperative evaluation of corneal astigmatism revealed that 42.9% of patients had a with-the-rule, 39.3% against-the-rule and 17.9% had an oblique astigmatism. In the scalar analysis, surgical induced astigmatism at 6 months was -0.45 Diopters (D) (±0.36) and -0.42 D at 1 year (±0.44). Both at 6 months and 1 year, the maximum value of induced astigmatism was -1.5 D. Through vector analysis, the average of the surgically induced astigmatism was -0.91 D (±0.74) at 6 months and -0.90 D (±0.72) at 1 year. The maximum values of induced astigmatism were -2.83 and -2.26 at 6 months and 1 year respectively.
We observed that after a combined surgery of phacoemulsification with intraocular lens implantation and trabeculectomy, any form of astigmatism tends to shift towards a with-the-rule astigmatism.
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