A Comparative Study Of Small Incision Lenticule Extraction And Sub-Bowman Keratomileusis To Correct Myopia And Astigmatism

Objective:To compare the clinical outcomes of small incision lenticule extraction (SMILE) and Sub-Bowman Keratomileusis (SBK) in treating myopia and astigmatism.Method:Twenty-nine patients were admitted to this trail, and30eyes were divided into SMILE group with27eyes into SBK group. Diopter, uncorrected visual acuity (UCVA), best corrected visual acuity (BSCVA), contrast sensitivity (CS) in different spatial frequencies and light and dark fields, high order aberrations (HOAs) and spherical aberration (SA) were recorded one month and three months postoperatively. There were no significant differences on all these measurements between SBK group and SMILE group before surgery.Results:(1) There were no significant differences on visual acuity, diopter, effectiveness, predictability and stability between SBK group and SMILE group (P>0.05).(2) Compared with preoperative evaluation, contrast sensitivity in different spatial frequencies and light and dark fields were decreased obviously one month and three months postoperatively (P<0.05).(3) Compared with preoperative evaluation, high order aberrations and spherical aberration were increased obviously one month and three months postoperatively, but postoperative high order aberrations and spherical aberration of SMILE group were significantly lower than those of SBK group (P<0.05).Conclusion:Both of SMILE and SBK are effective on treating myopia and astigmatism. However, in this study, SMILE group shows lower CS than SBK group at some spatical frequencies. Moreover, SMILE group shows lower high order aberrations, especially spherical aberration. Compared with SBK group, SMILE group has better visual quality than SBK group.