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Recent Advances in Ophthalmology. 2014, (12) Core

Effects of different incision sizes on corneal topography changes after femtosecond lenticule extraction surgery for myopiaChinese Full Text

LI Kai;WANG Yu-Liang;ZHANG Chuan-Wei;WU Jing;HUANG Hai-Yan;the Department of Ophthalmology,the Affiliated Hospital of Nanjing University of Traditional Chinese Medicine;

Abstract: Objective To evaluate the effects of different incision sizes on the changes of corneal topography after femtosecond laser lenticule extraction for myopia. Methods A total of 80 patients（ 160 eyes） underwent femtosecond laser lenticule extraction were divided into three groups according to incision sizes: Group A（ incision size 19. 0 mm,50 eyes）,group B（ incision size 5. 0 mm,50 eyes）,group C（ incision size 2. 5 mm,60 eyes）. The best corrected visual acuity（ BCVA）,uncorrected visual acuity（ UCVA）,diopter,intraocular pressure and corneal topography were performed before operation and 1 day,1 week,1 month,3 months,and 6 months after operation. Simulated keratoscopy reading（ Sim K）,difference quantity（ Diff）,3 mm irregular quantity（ Irreg） and 5 mm Irreg were recorded and analyzed. Results Compared with before operation,UCVA of three groups had no significantly difference at postoperative 1 week,1 month,3 months and 6 months（ all P ＞ 0. 05）. In all patients,Sim K difference value decreased significantly after the operation（ all P ＜ 0. 05）,but that of three groups showed no significant difference（ P＞ 0. 05）. The postoperative 3 mm Irreg and 5 mm Irreg of each group were significantly higher than before operation（ all P ＜ 0. 05）. After 6 months of operation,3 mm Irreg and 5 mm Irreg of group C were lower than those in group A and group B,but the difference only in 5 mm Irreg between group C and A had statistical significant（ P = 0. 024）. Postoperative posterior corneal surface Diff value of each group were much higher than preoperative ones（ all P ＜ 0. 05）. At postoperative 6 months,posterior corneal surface Diff value increased amount of group C and B were lower than those of group A,but the difference was not statistically significant（ P ＞ 0. 05）. Conclusion Small incision lenticule extraction show good effects in postoperative corneal astigmatism,corneal regularity and posterior corneal surface ectasia.
Keywords：

femtosecond laser; lenticule extraction; myopia; cornea; corneal topography;

  • DOI：

    10.13389/j.cnki.rao.2014.0315

  • Series：

  • Subject：

  • Classification Code：

    R779.63

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