Comparison of Corneal Power and Astigmatism between Simulated Keratometry, True Net Power, and Total Corneal Refractive Power before and after SMILE Surgery
Table 3
Surgically induced changes in astigmatisms (SIA) calculated by vector analyses in delta-refractive astigmatisms (delta-RAs) and delta-corneal astigmatisms (delta-Kas), means of differences between the vectors of delta-RAs and delta-Kas, and 95% limits of agreement (LOA).
SIA (D × degree)
J0 [(delta-RA)–(delta-Ka)]
J45 [(delta-RA)–(delta-Ka)]
Mean
95% LOA
Mean
95% LOA
Delta-RA
(0.58 ± 0.61 D) × 90.8
na
na
na
na
Delta-simKa
1 mm
(0.74 ± 0.70) × 96.4
0.07
−0.63 to 0.77
0.07
−0.58 to 0.72
2 mm
(0.65 ± 0.64) × 96.8
0.03
−0.51 to 0.56
0.07
−0.44 to 0.58
3 mm
(0.46 ± 0.58) × 94.7
−0.06
−0.53 to 0.41
0.03
−0.34 to 0.40
4 mm
(0.27 ± 0.55) × 92.8
−0.16
−0.70 to 0.39
0.005
−0.37 to 0.38
5 mm
(0.08 ± 0.43) × 94.2
−0.25
−0.94 to 0.44
−0.003
−0.42 to 0.42
6 mm
(0.11 ± 0.40) × 0.42
−0.34
−1.32 to 0.63
−0.01
−0.58 to 0.56
7 mm
(0.19 ± 0.53) × 3.6
−0.39
−1.63 to 0.86
−0.02
−0.73 to 0.69
8 mm
(0.18 ± 0.68) × 8.1
−0.38
−1.74 to 0.98
−0.03
−0.83 to 0.76
Delta-TNPa
1 mm
(0.80 ± 0.80) × 97.1
0.10
−0.67 to 0.86
0.09
−0.63 to 0.81
2 mm
(0.72 ± 0.71) × 96.8
0.06
−0.53 to 0.65
0.08
−0.50 to 0.65
3 mm
(0.52 ± 0.64) × 94.4
−0.04
−0.50 to 0.43
0.03
−0.36 to 0.43
4 mm
(0.29 ± 0.60) × 92.7
−0.15
−0.70 to 0.40
0.005
−0.39 to 0.40
5 mm
(0.08 ± 0.50) × 94.7
−0.25
−1.00 to 0.49
−0.002
−0.43 to 0.42
6 mm
(0.09 ± 0.42) × 176.7
−0.33
−1.32 to 0.65
−0.003
−0.59 to 0.58
7 mm
(0.19 ± 0.57) × 2.7
−0.38
−1.67 to 0.90
−0.02
−0.75 to 0.72
8 mm
(0.18 ± 0.76) × 10.5
−0.37
−1.80 to 1.06
−0.04
−0.89 to 0.81
Delta-TCRPa
1 mm
(0.80 ± 0.79) × 97.0
0.10
−0.65 to 0.85
0.09
−0.63 to 0.80
2 mm
(0.78 ± 0.74) × 96.6
0.09
−0.49 to 0.66
0.08
−0.48 to 0.64
3 mm
(0.57 ± 0.65) × 94.8
−0.008
−0.46 to 0.45
0.04
−0.35 to 0.43
4 mm
(0.36 ± 0.63) × 92.6
−0.11
−0.66 to 0.44
0.008
−0.38 to 0.40
5 mm
(0.16 ± 0.50) × 94.9
−0.21
−0.90 to 0.47
0.005
−0.40 to 0.41
6 mm
(0.06 ± 0.45) × 166.0
−0.32
−1.32 to 0.69
0.006
−0.56 to 0.58
7 mm
(0.20 ± 0.64) × 179.7
−0.39
−1.76 to 0.98
−0.007
−0.78 to 0.76
8 mm
(0.19 ± 0.99) × 14.9
−0.37
−2.08 to 1.34
−0.06
−1.05 to 0.94
95% limits of agreement = mean difference ± 1.96 × standard deviation of the difference. simK: simulated keratometry; TNP: true net power; TCRP: total corneal refractive power.
