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Table 1 Correlation of visual outcomes with decentration from CSCLR in eyes with astigmatism higher than 2.5 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 = 10)
0.1~0.2
(n = 16)
> 0.2
(n = 22)
P
Predictability (n = 48)  
 SE within 0.5D 9 (90%) 13 (81.3%) 21 (95.5%) 0.429
 SE within 1.0D 0 2 (12.5%) 1 (4.5%)
 SE more than 1.0D 1 (10%) 1 (6.3%) 0
Efficacy
 UDVA 20/20 or better 9 (90%) 13 (81.3%) 16 (72.7%) 0.520
 20/25 to 20/40 1 (10%) 3 (18.8%) 6 (27.3%)
 Worse than 20/40 0 0 0
 Efficacy index (Overall = 1.00 ± 0.18) 0.98 ± 0.18 1.00 ± 0.20 1.00 ± 0.17 0.934
Safety
 Improved by at least 1 line 1 (10%) 3 (18.3%) 3 (13.6%) 0.471
 No change 8 (80%) 13(81.3%) 15 (68.2%)
 Worsen by at least 1 line 1 (10%) 0 4 (18.2%)
 Safety index (Overall = 0.99 ± 0.11) 0.97 ± 0.09 1.02 ± 0.11 0.97 ± 0.12 0.406
Correction of astigmatism
 Preoperative cylindrical error by MR (D) −3.23 ± 0.17 − 3.17 ± 0.70 −3.09 ± 0.62 0.84
 Postoperative cylindrical error by MR (D) −0.68 ± 0.21 − 0.44 ± 0.44 −0.61 ± 0.42 0.261
 CI 0.87 ± 0.14 0.89 ± 0.14 0.88 ± 0.14 0.969
 IOS 0.21 ± 0.06 0.14 ± 0.15 0.20 ± 0.13 0.329
Wavefront and OSI
HOA 0.21 ± 0.15 0.18 ± 0.09 0.31 ± 0.22 0.058
SA 0.01 ± 0.37 0.18 ± 0.13 0.24 ± 0.21 0.042
Vertical coma 0.14 ± 0.50 0.29 ± 0.46 0.23 ± 0.45 0.727
Horizontal coma −0.20 ± 0.36 −0.22 ± 0.28 − 0.16 ± 0.39 0.843
Coma −0.06 ± 0.24 −0.08 ± 0.23 0.16 ± 0.30 0.013
 MTF cutoff (cpd) 33.3 ± 8.13 36.6 ± 11.5 35.1 ± 10.1 0.731
 OSI 1.0 ± 0.66 0.99 ± 0.70 0.91 ± 0.63 0.904
 SR 0.17 ± 0.03 0.19 ± 0.05 0.19 ± 0.05 0.460
 OV 100% 1.10 ± 0.25 1.22 ± 0.38 1.18 ± 0.34 0.695
 OV 20% 0.75 ± 0.19 0.88 ± 0.29 0.84 ± 0.26 0.464
 OV 9% 0.42 ± 0.11 0.49 ± 0.15 0.48 ± 0.15 0.429
  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