Anterior and Posterior Corneal Astigmatism after Refractive Lenticule Extraction for Myopic Astigmatism

Table 3

Changes in anterior and posterior corneal astigmatism, refractive astigmatism, and refraction after vectorial conversion in eyes undergoing femtosecond lenticule extraction (FLEx) and small incision lenticule extraction (SMILE).

	FLEx group	SMILE group	value
	Anterior corneal astigmatism
ΔAmount (D)	0.33 ± 0.61 (95% CI, −0.85 to 1.52)	0.30 ± 0.54 (95% CI, −0.76 to 1.35)	0.943
	0.22 ± 0.30 (95% CI, −0.37 to 0.81)	0.17 ± 0.28 (95% CI, −0.39 to 0.72)	0.435
	0.01 ± 0.27 (95% CI, −0.53 to 0.55)	−0.05 ± 0.24 (95% CI, −0.52 to 0.43)	0.374
	Posterior corneal astigmatism
ΔAmount (D)	0.03 ± 0.10 (95% CI, −0.17 to 0.23)	0.01 ± 0.08 (95% CI, −0.15 to 0.17)	0.428
	0.02 ± 0.05 (95% CI, −0.08 to 0.11)	0.00 ± 0.04 (95% CI, −0.07 to 0.08)	0.121
	0.00 ± 0.05 (95% CI, −0.10 to 0.11)	−0.01 ± 0.04 (95% CI, −0.08 to 0.06)	0.108
	Refractive astigmatism
ΔAmount (D)	−0.49 ± 0.58 (95% CI, −1.62 to 0.64)	−0.78 ± 0.44 (95% CI, −1.64 to 0.09)	0.082
	−4.68 ± 1.35 (95% CI, −7.32 to −2.04)	−4.69 ± 1.77 (95% CI, −8.16 to −1.21)	0.788
	0.31 ± 0.29 (95% CI, −0.26 to 0.88)	0.26 ± 0.34 (95% CI, −0.40 to 0.92)	0.788
	−0.01 ± 0.30 (95% CI, −0.59 to 0.58)	−0.02 ± 0.18 (95% CI, −0.38 to 0.33)	0.733
	4.45 ± 1.36 (95% CI, 1.79 to 7.11)	4.53 ± 1.79 (95% CI, 1.03 to 8.04)	0.753

FLEx: femtosecond lenticule extraction, SMILE: small incision lenticule extraction, CI: confidence interval, D: diopter, : spherical equivalent refraction, : Jackson cross cylinder, axes at 0 and 90 degrees, : Jackson cross cylinder, axes at 45 and 135 degrees, and : blur strength.