Topographic and surgical risk factors for high postoperative residual astigmatism after small incision lenticule extraction in patients with different degrees of myopia: a retrospective cohort study

Table 2 Risk factors for high postoperative residual astigmatism in patients with low myopia

Covariate	Coefficient	95% CI		P
Covariate	Coefficient	Lower limit	Upper limit	P
Age	-0.002	-0.014	0.007	0.680
Sex	0.001	-0.153	0.222	0.733
Cycloplegic refraction
SE	0.004	-0.070	0.104	0.863
Sphere	0.011	-0.182	0.201	0.932
Cylinder	-0.042	-0.319	0.204	0.745
Axis	-0.014	-0.208	0.179	0.874
IOP	-0.005	-0.024	0.020	0.750
BCVA	-1.379	-3.114	0.276	0.124
Manifest refraction
SE	0.013	-0.092	0.261	0.777
Sphere	0.014	-0.172	0.207	0.882
Cylinder	0.011	-0.217	0.239	0.943
Axis	-0.006	-0.158	0.155	0.978
Steep corneal curvature	0.320	0.106	0.727	0.015*
Flat corneal curvature	0.003	-0.038	0.041	0.903
Topographic cylinder	0.032	-0.003	0.140	0.071
Topographic axis	0.092	-0.491	0.695	0.782
CCT
Apex	0.222	-0.019	1.134	0.080
Thinnest	0.005	-0.004	0.009	0.857
Difference	-0.001	-0.012	0.011	0.923
ISV	0.097	-0.049	0.143	0.192
IHD	0.076	-0.032	0.135	0.088
Angle Kappa	0.072	-0.043	0.196	0.094
Lenticule thickness	0.005	-0.004	0.012	0.329
Optic zone	-0.038	-0.515	0.087	0.083
Incision length	-0.127	-0.382	0.124	0.333

BCVA: best-corrected visual acuity, CCT: central corneal thickness, CI: confidence interval, IHD: index of height decentration, IOP: intraocular pressure, ISV: index of surface variance, N: number, SE: spherical equivalent
* denotes a significant effect of the covariate

ISSN: 1471-2415