A comparison study of corneal topographic changes following 20-, 23-, and 25-G pars plana vitrectomy

作者：Grandinetti Alexandre Achille^*; Kniggendorf Vinicius; Moreira Luciane Bugmann; Moreira Junior Carlos Augusto; Ramos Moreira Ana Tereza

来源：Arquivos Brasileiros de Oftalmologia, 2015, 78(5): 283-285.

DOI：10.5935/0004-2749.20150075

• Retina
• Vitrectomy
• Cornea
• Corneal topography
• Astigmatism

Purpose: To evaluate and compare corneal topographic changes following pars plana vitrectomy with the 23-gauge (G) and 25-G transconjuntival sutureless vitrectomy system as well as the standard 20-G vitrectomy system.
Methods: We prospectively evaluated corneal topographic changes in 45 eyes of 45 patients divided into three groups according to vitrectomy system used (20-, 23-, and 25-G). All patients underwent computer-assisted videokeratography using an EyeSys System 3000 topographer preoperatively and at one week, one month, and three months postoperatively.
Results: In the 20-G vitrectomy group, we found statistically significant postoperative changes in corneal curvature parameters with an average steepening of 0.98 +/- 0.18 D (P < 0.001) and 0.93 +/- 0.21 D (P < 0.001) at one week and one month, respectively. No statistically significant difference was observed at the three-month follow-up visit. In the 23- and 25-G groups, no statistically significant changes in corneal curvature parameters were observed at any postoperative follow-up visit.
Conclusion: Twenty-three-gauge and 25-gauge transconjunctival sutureless vitrectomy did not induce topographic corneal changes following surgery, whereas 20-G vitrectomy was found to induce transient topographic corneal changes that had returned to preoperative levels at three months postoperatively.

• 出版日期2015-10