Comparison of Corneal Power and Astigmatism between Simulated Keratometry, True Net Power, and Total Corneal Refractive Power before and after SMILE Surgery
Table 1
Comparisons of the preoperative corneal cylindrical errors between 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
(0.94 ± 0.56) × 91.2
(0.71 ± 0.57) × 89.7
(0.74 ± 0.57) × 89.9
0.20 ± 0.20
6.9 ± 12.2
0.03 ± 0.13
1.1 ± 4.7
0.23 ± 0.15
6.9 ± 12.2
2 mm
(1.11 ± 0.57) × 91.3
(0.88 ± 0.57) × 90.3
(0.93 ± 0.58) × 90.6
0.18 ± 0.16
4.6 ± 9.4
0.05 ± 0.18
1.5 ± 8.2
0.24 ± 0.15
5.0 ± 11.0
3 mm
(1.17 ± 0.55) × 91.6
(0.97 ± 0.54) × 91.7
(1.02 ± 0.55) × 91.9
0.14 ± 0.14
3.1 ± 6.0
0.05 ± 0.13
0.8 ± 5.1
0.20 ± 0.09
2.8 ± 4.4
4 mm
(1.19 ± 0.56) × 92.4
(1.02 ± 0.53) × 93.1
(1.11 ± 0.57) × 93.1
0.09 ± 0.13
2.9 ± 5.5
0.08 ± 0.10
0.8 ± 5.0
0.17 ± 0.09
2.6 ± 4.0
5 mm
(1.15 ± 0.57) × 94
(1.01 ± 0.57) × 94.6
(1.13 ± 0.60) × 94.9
0.04 ± 0.14
3.1 ± 5.8
0.13 ± 0.19
0.8 ± 4.1
0.14 ± 0.15
2.6 ± 4.7
6 mm
(1.05 ± 0.59) × 96.3
(0.98 ± 0.57) × 96.6
(1.12 ± 0.65) × 97.1
0.07 ± 0.16
3.3 ± 7.3
0.14 ± 0.14
1.2 ± 3.3
0.07 ± 0.11
2.7 ± 6.4
7 mm
(0.95 ± 0.60) × 98.2
(0.95 ± 0.58) × 97.2
(1.12 ± 0.69) × 97.9
0.16 ± 0.36
3.7 ± 8.2
0.17 ± 0.17
1.6 ± 4.1
0.03 ± 0.10
3.5 ± 7.2
8 mm
(0.91 ± 0.61) × 98.2
(1.01 ± 0.61) × 95.7
(1.25 ± 0.77) × 96.5
0.53 ± 0.98
5.3 ± 10.9
0.25 ± 0.26
2.5 ± 9.1
0.13 ± 0.11
4.4 ± 8.0
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.
