Abstract
Purpose :
To compare the predictability of ablation depth in central cornea between small incision 1enticule extraction(SMILE) and femtosecond laser-assisted LASIK.
Methods :
This is a retrospective, investigational，comparative case study. One hundred and four patients(201 eyes) underwent SMILE and 108 patients (202 eyes) underwent FS-LASIK were enrolled．Central corneal thickness was measured by RTVue FD-OCT before and 1 month after surgery．The differences between the actual and theoretically expected depth were defined as the central corneal cutting error and were compared between two groups.
Results :
In SMILE group，The actual ablation depth was significantly less than the theoretically values,（78.34±16.57μm vs 94.25±15.92μm）（t=-25.178，P<0.01）, while there are no significant difference in FS-LASIK group （86.92±25.56μm vs 89.71±24.93μm (t=-0.816，P=0.489）．In contrast，the central corneal cutting error was statistically higher in SMILE group than in FS-LASIK group（19.49±7.24μm vs 7.35±6.21μm）（t=13.67，P<0.01）．
Conclusions :
The actual corneal ablation depth was significantly less than the theoretical value by SMILE procedure, while the disparities were not significant in FS-LASIK , the predictability of FS-LASIK was better.
This abstract was presented at the 2019 ARVO Imaging in the Eye Conference, held in Vancouver, Canada, April 26-27, 2019.