Small Incision Lenticule Extraction (SMILE) for Moderate and High Myopia: Seven-Year Outcomes of Refraction, Corneal Tomography, and Wavefront Aberrations

Table 2

Corneal stability analysis of Scheimpflug imaging.

Parameters	Pre	1 month	1 year	5 year	7 year
CCT	544.11 ± 28.19	435.06 ± 39.63^a	439.89 ± 38.23^ab	445.56 ± 36.10^ab	442.06 ± 37.72^ab	<0.001
MCFC	43.53 ± 0.27	38.56 ± 0.44^a	38.87 ± 0.43^ab	39.00 ± 0.40^ab	39.15 ± 0.40^abc	<0.001
MCBC	−6.37 ± 0.23	−6.38 ± 0.22	−6.34 ± 0.20	−6.36 ± 0.23	−6.34 ± 0.21	0.089
PCE	3.22 ± 2.76	1.50 ± 2.01^a	0.67 ± 2.22^a	1.94 ± 3.32	1.72 ± 2.54	<0.001
ΔPCE	—	−0.71 ± 3.14	−1.82 ± 4.61	−0.88 ± 4.06	−1.76 ± 4.02	0.463

CCT = central corneal thickness; MCFC = mean corneal front curvature (from central 4 mm diameter cornea); MCBC = mean corneal back curvature (from central 4 mm diameter cornea); PCE = posterior central elevation; ΔPCE = subtracting preoperative PCE from postoperative PCE; ^avs pre values of statistical significance (); ^bvs 1-month values of statistical significance (); ^cvs 1-year values of statistical significance ().