Effect of Cap-Lenticule Diameter Difference on the Visual Outcome and Higher-Order Aberrations in SMILE: 0.4 mm versus 1.0 mm
Table 1
Demographic and ocular findings of the study groups throughout the study.
Group 1 (CLDD = 0.4 mm)
Group 2 (CLDD = 1.0 mm)
p valuea
Number of patients
54
78
Number of eyes
108
156
Age (years), mean ± SD (range)
29.25 ± 5.36 (19–39)
29.54 ± 5.03 (20–40)
0.326
Gender (male/female)
33/21
46/32
Sphere (D)
Preoperative
−3.01 ± 1.81
−3.13 ± 1.72
0.582
Month 6
−0.02 ± 0.36
−0.01 ± 0.42
0.943
p valueb
<0.001
<0.001
Spherical equivalent (D)
Preoperative
−3.47 ± 1.78
−3.55 ± 1.80
0.750
Month 6
−0.20 ± 0.37
−0.24 ± 0.43
0.412
p valueb
<0.001
<0.001
CDVA (logMAR)
Preoperative
−0.08 ± 0.08
−0.08 ± 0.08
0.658
Day 1
−0.07 ± 0.07
0.04 ± 0.07
<0.001
Week 1
−0.07 ± 0.07
−0.04 ± 0.07
0.001
Month 1
−0.08 ± 0.07
−0.07 ± 0.07
0.333
Month 3
−0.08 ± 0.07
−0.07 ± 0.07
0.445
Month 6
−0.08 ± 0.07
−0.08 ± 0.07
0.456
p valuec
0.089
<0.001
UDVA (logMAR)
Day 1
0.07 ± 0.07
0.29 ± 0.09
<0.001
Week 1
0.02 ± 0.06
0.11 ± 0.08
<0.001
Month 1
−0.05 ± 0.07
0.02 ± 0.06
<0.001
Month 3
−0.07 ± 0.07
−0.04 ± 0.06
<0.001
Month 6
−0.08 ± 0.07
−0.06 ± 0.06
0.038
p valuec
<0.001
<0.001
Total HOAs (μm)
Preoperative
0.16 ± 0.06
0.14 ± 0.12
0.248
Month 6
0.24 ± 0.08
0.32 ± 0.26
0.002
p valueb
<0.001
<0.001
Horizontal coma (μm)
Preoperative
0.02 ± 0.02
0.02 ± 0.02
0.937
Month 6
0.04 ± 0.03
0.07 ± 0.05
<0.001
p valueb
<0.001
<0.001
Vertical coma (μm)
Preoperative
−0.02 ± 0.02
−0.03 ± 0.02
0.326
Month 6
−0.14 ± 0.02
−0.24 ± 0.02
<0.001
<0.001
<0.001
Spherical aberration (μm)
Preoperative
0.23 ± 0.05
0.23 ± 0.06
0.786
Month 6
0.36 ± 0.01
0.49 ± 0.04
<0.001
p valueb
<0.001
<0.001
CLDD: cap-lenticule diameter difference; SD: standard deviation; CDVA: corrected distance visual acuity; UDVA: uncorrected distance visual acuity; HOA: higher-order aberrations. aIndependent sample t-test for the difference between study groups. bPaired t-test for the significance of intragroup change during study. cRepeated measures of ANOVA for the significance of intragroup change during study.
