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Table 2 Correlation of visual outcomes with decentration from CSCLR in eyes with astigmatism less than 1.5 diopters

From: Decentration following femtosecond laser small incision lenticule extraction (SMILE) in eyes with high astigmatism and its impact on visual quality

  Decentration, mm
< 0.1
(n = 13)
0.1~0.2
(n = 25)
> 0.2
(n = 28)
P
Predictability  
 SE within 0.5D 13 (100%) 25 (100%) 25 (89.3%) 0.371
 SE within 1.0D 0 0 2 (7.1%)
 SE more than 1.0D 0 0 1 (3.6%0
Efficacy
 UDVA 20/20 or better 13 (100%) 25 (100%) 28 (100%) 0.502
 20/25 to 20/40 0 0 0
 Worse than 20/40 0 0 0
 Efficacy index (Overall = 1.07 ± 0.11) 1.07 ± 0.11 1.06 ± 0.11 1.07 ± 0.12 0.955
Safety
 CDVA Improved by at least 1 line 0 1 (4%) 2 (7.1%) 0.585
 No change 13 (100%) 24 (96%) 26 (91.9%)
 Worsen by at least 1 line 0 0 0
 Safety index (Overall = 0.98 ± 0.12) 0.98 ± 0.10 0.97 ± 0.13 0.99 ± 0.12 0.786
Correction of astigmatism
 Preoperative cylindrical error by MR (D) −0.56 ± 0.46 −0.77 ± 0.41 −0.48 ± 0.41 0.047
 Postoperative cylindrical error by MR (D) −0.21 ± 0.17 − 0.15 ± 0.22 − 0.26 ± 0.21 0.165
 CI 0.78 ± 0.63 1.02 ± 0.52 0.73 ± 0.62 0.194
 IOS 0.33 ± 0.41 0.18 ± 0.29 0.41 ± 0.56 0.179
Wavefront and OSI
HOA 0.21 ± 0.17 0.23 ± 0.12 0.21 ± 0.17 0.936
SA 0.33 ± 0.22 0.36 ± 0.24 0.31 ± 0.22 0.714
Vertical coma 0.07 ± 0.31 0.16 ± 0.26 0.28 ± 0.36 0.116
Horizontal coma −0.22 ± 0.23 −0.33 ± 0.28 −0.21 ± 0.25 0.20
Coma 0.10 ± 0.16 0.15 ± 0.17 0.08 ± 0.21 0.391
 MTF cutoff (cpd) 31.7 ± 9.3 32.8 ± 9.8 35.1 ± 7.8 0.448
 OSI 1.06 ± 0.58 0.92 ± 0.55 0.79 ± 0.40 0.256
 SR 0.17 ± 0.04 0.20 ± 0.12 0.21 ± 0.11 0.44
 OV 100% 1.04 ± 0.30 1.10 ± 0.33 1.16 ± 0.26 0.455
 OV 20% 0.70 ± 0.22 0.77 ± 0.24 0.82 ± 0.20 0.295
 OV 9% 0.41 ± 0.14 0.46 ± 0.15 0.51 ± 0.13 0.081
  1. SE spherical equivalent, CI correction index, IOS index of success, HOA surgical induced change in higher-order aberrations, SA surgical induced change in spherical aberrations, OSI Objective scatter index