One-Year Visual and Refractive Outcomes following LASIK for Myopia and Myopic Astigmatism with MEL 90 versus Schwind Amaris 750S Excimer Laser: A Comparative Study

Table 2

The postoperative visual and refractive results obtained at 1 year for both study groups.

Parameter (mean ± SD) (range)	Schwind Amaris 750S	MEL 90	value
Sphere (D)	−0.15 ± 0.20 (−0.75 to 1.25)	−0.15 ± 0.21 (−1.00 to 0.50)	1.00
Cylinder (D)	−0.13 ± 0.18 (−0.75 to 0.5)	−0.14 ± 0.21 (−1.00 to 0.00)	0.79
SE (D)	−0.21 ± 0.22 (−0.87 to 1.25)	−0.23 ± 0.23 (−1.00 to 0.25)	0.29
UDVA (logMAR)	−0.10 ± 0.09 (−0.2 to 0.2)	−0.05 ± 0.07 (−0.20 to 0.10)	0.24
CDVA (logMAR)	−0.14 ± 0.06 (−0.2 to 0)	−0.09 ± 0.08 (−0.20 to 0.00)	0.24
Safety index	1.12 ± 0.16 (0.62 to 1.6)	1.08 ± 0.15 (0.78 to 1.6)	0.29
Efficacy index	1.02 ± 0.10 (0.63 to 1.28)	1.00 ± 0.10 (0.5 to 1.25)	0.90
AOE (arithmetic)	0.29 ± 6.05 (−24 to 30)	0.37 ± 7.34 (−30 to 40)	0.96
AOE (absolute)	2.87 ± 5.33 (0 to 30)	3.22 ± 6.60 (0 to 40)	0.82
CI	0.95 ± 0.33 (0 to 2.02)	0.93 ± 0.26 (0.21 to 1.48)	0.80

SD: standard deviation; SE: spherical equivalent; UDVA: uncorrected distance visual acuity; CDVA: corrected distance visual acuity; AOE: angle of error; CI: correction index.