The comparison of visual outcomes, aberrations, and Bowman’s layer micro-distortions after femtosecond laser small-incision lenticule extraction (SMILE) for the correction of high and moderate myopia and myopic astigmatism

Table 3 Preoperative vs postoperative HOAs after small-incision lenticule extraction for correcting myopia and myopic astigmatism

	Preoperative			6 Months Postoperative
Parameters (Mean ± SD)	group 1	group 2	P Value	group 1	group 2	P Value
HOA RMS	0.23 ± 0.092	0.21 ± 0.067	0.48	0.36 ± 0.11	0.41 ± 0.13	0.09
Spherical Aberration	0.084 ± 0.080	0.071 ± 0.040	0.42	0.094 ± 0.067	0.20 ± 0.12	< 0.01
Coma	0.13 ± 0.091	0.11 ± 0.072	0.33	0.26 ± 0.13	0.25 ± 0.14	0.94
Trefoil	0.12 ± 0.054	0.10 ± 0.067	0.44	0.13 ± 0.073	0.11 ± 0.070	0.34
	Preoperative compared with 6 Months Postoperative
Parameters	group 1		group 2
(Mean ± SD)	Mean Difference	P Value	Mean Difference	P Value
HOA RMS	0.13 ± 0.11	< 0.01	0.19 ± 0.15	< 0.01
Spherical Aberration	0.010 ± 0.078	0.44	0.12 ± 0.14	< 0.01
Coma	0.13 ± 0.13	< 0.01	0.14 ± 0.14	< 0.01
Trefoil	0.015 ± 0.071	0.22	0.01 ± 0.081	0.74

SD = Standard deviation; D = Diopters; group 1 = small-incision lenticule extraction for myopia and myopic astigmatism ≤10 D; group 2 = small-incision lenticule extraction for myopia and myopic astigmatism > − 10 D; HOA RMS = root mean square of total higher-order aberration

ISSN: 1471-2415