Corneal Spherical Aberration and Corneal Asphericity after Small Incision Lenticule Extraction and Femtosecond Laser-Assisted LASIK

Table 1

Preoperative characteristics by group.

Parameters	SMILE ()	FS-LASIK ()	value
Age (years)	22.16 ± 3.87	23.22 ± 3.62	0.10
Gender (n)			0.64
Male	40	34
Female	30	30
UDVA (logMAR)	1.09 ± 0.30	1.17 ± 0.30	0.15
CDVA (logMAR)	0.00 ± 0.00	0.00 ± 0.01	0.32
Sphere (D)	−5.52 ± 1.21	−5.86 ± 1.46	0.15
Cylinder (D)	−0.62 ± 0.48	−0.68 ± 0.42	0.46
SE (D)	−5.83 ± 1.23	−6.20 ± 1.52	0.13
Corneal spherical aberration (μm)
Anterior surface	0.25 ± 0.07	0.23 ± 0.07	0.23
Posterior surface	−0.15 ± 0.02	−0.16 ± 0.02	0.07
Total cornea	0.21 ± 0.08	0.18 ± 0.07	0.08
Corneal asphericity
Anterior surface	−0.22 ± 0.09	−0.25 ± 0.10	0.07
Posterior surface	−0.12 ± 0.11	−0.11 ± 0.13	0.49

SMILE: small incision lenticule extraction; FS-LASIK: femtosecond laser-assisted laser in situ keratomileusis; UDVA: uncorrected distance visual acuity; CDVA: corrected distance visual acuity; D: diopters; SE: spherical equivalent.