Comparison of the Clinical Outcomes between Combined Femtosecond Laser-Assisted In Situ Keratomileusis and Corneal Cross Linking versus Combined Small-Incision Lenticule Extraction and Corneal Cross Linking

Table 1

Demographics and preoperative data in the 2 groups.

	FS-LASIK Xtra	SMILE Xtra	t	value
Age(years)	25.25 ± 4.61	25.08 ± 5.26	0.082	0.935
Female	7	7	—	—
Male	5	5	—	—
MRSE (diopters)	−5.752 ± 1.71	−5.297 ± 0.99	−1.131	0.265
UDVA (log MAR)	1.336 ± 0.27	1.313 ± 0.15	0.359	0.721
CDVA (log MAR)	−0.02 ± 0.04	−0.03 ± 0.04	0.624	0.535
CCT (μm)	528.54 ± 20.52	531.58 ± 18.67	−0.537	0.594
K1 (diopters)	44.13 ± 1.57	44.65 ± 1.31	−1.25	0.218
K2 (diopters)	42.75 ± 1.52	43.38 ± 1.44	−1.485	0.144
K mean (diopters)	43.44 ± 1.51	44.00 ± 1.36	−1.348	0.184
SRI	0.16 ± 0.11	0.20 ± 0.18	−0.869	0.389
SAI	0.33 ± 0.11	0.29 ± 0.13	1.099	0.278
IOPcc	15.15 ± 2.29	15.15 ± 2.61	−0.006	0.995
IOPg	13.28 ± 2.60	13.83 ± 2.37	−0.772	0.444
CRF	8.89 ± 1.35	9.44 ± 1.23	−1.453	0.153
CH	9.39 ± 1.09	9.84 ± 1.30	−1.301	0.200
SimK mean	43.47 ± 1.46	44.05 ± 1.33	−1.417	0.163
Anterior instantaneous curvature	43.17 ± 1.52	43.80 ± 1.23	−1.561	0.125
Posterior axial curvature	−6.24 ± 0.25	−6.37 ± 0.23	1.764	0.084

MRSE = manifest refractive spherical equivalent; UDVA = uncorrected distance visual acuity; CDVA = corrected distance visual acuity; CCT = central corneal thickness; SRI = surface regularity index; SAI = surface asymmetry index; IOPcc = corneal compensated intraocular pressure; IOPg = Goldmann correlated intraocular pressure; CRF = corneal resistance factor; and CH = corneal hysteresis.