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Whitney Lomazow, Roger F. Steinert, Marjan Farid, Sumit Garg, Wenxin Wei, Garrick Chak; Femtosecond Laser Keratoplasty: Suture Removal and Impact on Astigmatism. Invest. Ophthalmol. Vis. Sci. 2011;52(14):3385.
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To study the effect of suture removal on refractive and topographical astigmatism in patients who underwent femtosecond laser keratoplasty (FLK), zigzag pattern.
Retrospective chart review at a single center referral academic practice identified patients who had suture removal after zig-zag incision FLK with at least 1 follow-up measurement. Topographical simK astigmatism was measured by either Orbscan or Pentacam and by manifest refraction prior to suture removal and at 1, 3, 6, 12, and 18 months after suture removal. Either a 24-bite running suture or a 16-bite running suture with 8 interrupted sutures was employed for these grafts. Eyes that had secondary surgical procedures or wound manipulation within the postoperative period were omitted. Data was compiled in a database and a paired t-test was used for statistical calculations.
25 eyes qualified for analysis. Average refractive cylinder before suture removal was 3.4 diopters and average topographical astigmatism was 4.3 diopters. After suture removal, the average refractive and topographical astigmatism at 1 month was 3.8 and 5.5 diopters respectively. At 3 months, the average refractive and topographical astigmatism was 3.85 and 4.2 diopters respectively. At 6 months the average refractive and topographical astigmatism was 3.7 and 3.8 diopters respectively. At 12 months the average refractive and topographical astigmatism was 3.5 and 3.7 diopters respectively At 18 months the average refractive and topographical astigmatism was 2.1and 2.4 diopters respectively
Suture removal in these eyes show an initial increase in refractive and topographical astigmatism at 1 month with a subsequent trend towards decreased astigmatism at 3, 6, and 12 months similar to the pre-suture removal baseline.
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