Comparison of Corneal Power and Astigmatism between Simulated Keratometry, True Net Power, and Total Corneal Refractive Power before and after SMILE Surgery
Table 2
Comparisons of the postoperative corneal cylindrical errors among simulated keratometry (simKa), true net power (TNPa), and total corneal refractive power (TCRPa) from 1 mm to 8 mm. All values were adjusted for the corneal plane using a vertex distance of 12 mm.
Vector means
Difference
simKa
TNPa
TCRPa
TCRPa versus simKa
TCRPa versus TNPa
simKa versus TNPa
Magnitude
|Angle|
Magnitude
|Angle|
Magnitude
|Angle|
1 mm
(0.25 ± 0.62) × 75.2
(0.21 ± 0.70) × 36.9
(0.20 ± 0.69) × 39.2
0.27 ± 0.19
10.5 ± 13.2
0.02 ± 0.09
1.3 ± 6.1
0.29 ± 0.18
9.9 ± 11.6
2 mm
(0.49 ± 0.56) × 83.8
(0.24 ± 0.61) × 69.7
(0.24 ± 0.61) × 69.2
0.30 ± 0.15
12.0 ± 14.9
0.01 ± 0.08
1.3 ± 8.2
0.30 ± 0.15
11.2 ± 12.7
3 mm
(0.71 ± 0.47) × 89.6
(0.46 ± 0.48) × 88.6
(0.46 ± 0.49) × 88.3
0.25 ± 0.12
11.4 ± 15.7
0.01 ± 0.05
0.6 ± 0.9
0.25 ± 0.12
11.2 ± 15.5
4 mm
(0.92 ± 0.47) × 92.3
(0.74 ± 0.49) × 93.2
(0.75 ± 0.50) × 93.4
0.18 ± 0.12
6.1 ± 10.4
0.01 ± 0.04
0.6 ± 0.9
0.19 ± 0.12
5.8 ± 9.8
5 mm
(1.07 ± 0.52) × 94.0
(0.93 ± 0.51) × 94.6
(0.98 ± 0.54) × 94.9
0.10 ± 0.13
3.5 ± 5.9
0.05 ± 0.05
0.6 ± 1.0
0.14 ± 0.12
3.2 ± 5.2
6 mm
(1.16 ± 0.68) × 95.8
(1.07 ± 0.67) × 95.7
(1.17 ± 0.74) × 96.0
0.01 ± 0.14
3.3 ± 4.8
0.10 ± 0.08
0.8 ± 1.3
0.09 ± 0.11
2.7 ± 3.9
7 mm
(1.15 ± 0.84) × 97.5
(1.14 ± 0.85) × 96.5
(1.31 ± 1.00) × 96.7
0.17 ± 0.25
4.5 ± 7.2
0.17 ± 0.17
1.1 ± 1.8
0.04 ± 0.15
3.7 ± 6.5
8 mm
(1.09 ± 0.93) × 98.2
(1.19 ± 0.98) × 96.4
(1.44 ± 1.25) × 97.6
0.35 ± 0.47
5.8 ± 11.3
0.26 ± 0.39
3.7 ± 10.9
0.12 ± 0.15
2.9 ± 4.1
Magnitude represented the magnitude of the vector difference. |Angle| was defined as the mean absolute values of the arithmetic difference between the axis of two corneal astigmatisms. It was defined always to be an acute angle.
