Polar Value Analysis of Low to Moderate Astigmatism with Wavefront-Guided Sub-Bowman Keratomileusis

Table 3

Polar values in anterior corneal astigmatism (ACA) by Sirius. All measurements with the steeper meridian of the preoperative total ocular astigmatism (TOA) as the reference plane.

	AKP	AKP + 45	Net astigmatism
Preop	1.41 ± 0.98	−0.11 ± 0.43	1.42 ± 0.65 @ 92.52°
Postop 1 m	0.45 ± 0.68	−0.03 ± 0.48	0.45 ± 0.57 @ 93.08°
Postop 3 m	0.44 ± 0.62	−0.03 ± 0.48	0.44 ± 0.55 @ 92.82°
Postop 6 m	0.43 ± 0.60	−0.05 ± 0.49	0.43 ± 0.54 @ 91.60°
F value	145.270	3.201	—
P value	< 0.001	0.048	—
SIA 1 m	−0.97 ± 0.79	0.08 ± 0.39	−0.98 ± 0.56 @ 92.31°
SIA 3 m	−0.98 ± 0.77	0.08 ± 0.36	−1.03 ± 0.55 @ 92.24°
SIA 6 m	−0.98 ± 0.77	0.06 ± 0.37	−1.00 ± 0.54 @ 93.95°
TIA	−1.14 ± 0.82	0.00	−1.14 ± 0.82 @ 94.68°
F value	11.405	3.201	—
P value	<0.001	0.048	—
Target of ACA	0.27 ± 0.46	−0.11 ± 0.43	0.29 ± 0.45 @ 83.90°
Error of treatment
1 m	0.18 ± 0.49	0.08 ± 0.39	0.19 ± 0.44 @ 107.21°
3 m	0.17 ± 0.48	0.08 ± 0.36	0.18 ± 0.43 @ 107.27°
6 m	0.16 ± 0.47	0.06 ± 0.37	0.17 ± 0.42 @ 104.92°
F value	10.176	3.201	—
P value	<0.001	0.048	—

SIA: surgical induced astigmatism, TIA: target-induced astigmatism, ACA: anterior corneal astigmatism.