Table 1.

Preoperative refractive characteristics of the patients

	FLEX		FemtoLASIK
	Mean ± SD	Range	Mean ± SD	Range
Sphere*	−4.26 ± 1.52	−1.00 to −5.75	−4.01 ± 1.71	−1.00 to −6.75
Cylinder**	−0.94 ± 1.12	0.00 to −3.00	−1.14 ± 0.96	0.00 to −2.75
SE***	−4.74 ± 1.60	−1.75 to −6.75	−4.58 ± 1.49	−1.50 to −7.00
Mesopic pupil diameter (mm)	5.84 ± 0.78	4.96 to 6.45	5.32 ± 0.80	4.36 to 6.50

Notes:

^*Spherical component of the manifest refraction in the negative cylinder notation;

^**cylindrical component of the manifest refraction in the negative cylinder notation;

^***spherical equivalent of the manifest refraction.

Abbreviations: FLEX, femtosecond lenticule extraction; FemtoLASIK, femtosecond laser-assisted in situ keratomileusis; SD, standard deviation; SE, spherical equivalent.