Simultaneous versus Sequential Accelerated Corneal Collagen Cross-Linking and Wave Front Guided PRK for Treatment of Keratoconus: Objective and Subjective Evaluation
Table 3
Preoperative and postoperative visual and refractive parameters (mean ± SD) in the 2 studied groups 6 months and 12 months following the full procedure.
Measure
Group
Preoperative measure
6 months
12 months
; repeated measures ANOVA
; preoperative versus 6 m
; preoperative versus 12 m
; 6 m versus 12 m
UDVA (logMAR)
G1
0.92 ± 0.33
0.19 ± 0.9
0.18 ± 0.06
<0.001
<0.001
<0.001
0.66
G2
0.95 ± 0.31
0.14 ± 0.11
0.13 ± 0.08
<0.001
<0.001
<0.001
0.45
0.35
0.08
0.07
—
—
—
—
CDVA (logMAR)
G1
0.32 ± 0.25
0.14 ± 0.07
0.13 ± 0.08
<0.001
<0.001
<0.001
0.86
G2
0.29 ± 0.22
0.09 ± 0.06
0.09 ± 0.05
<0.001
<0.001
<0.001
0.91
0.41
0.13
0.06
—
—
—
—
Refractive sphere (D)
G1
−2.2 ± 1.82
−0.55 ± 0.82
−0.53 ± 0.79
<0.001
<0.001
<0.001
0.93
G2
−1.8 ± 1.56
−0.46 ± 0.66
−0.42 ± 0.63
<0.001
<0.001
<0.001
0.12
0.61
0.42
0.33
—
—
—
—
Refractive cylinder (D)
G1
−2.9 ± 1.6
−1.2 ± 0.79
−1.2 ± 0.76
<0.001
<0.001
<0.001
0.98
G2
−2.7 ± 1.4
−0.9 ± 0.66
−0.9 ± 0.65
<0.001
<0.001
<0.001
0.87
0.53
0.42
0.37
—
—
—
—
MRSE (D)
G1
−3.7 ± 2.4
−1.4 ± 0.72
−1.3 ± 0.79
<0.001
<0.001
<0.001
0.67
G2
−3.8 ± 2.6
−1.1 ± 0.71
−1.00 ± 0.68
<0.001
<0.001
<0.001
0.88
0.77
0.46
0.34
—
—
—
—
: unpaired -test for comparison between the 2 groups. Significant values are bolded. UDVA: uncorrected distant visual acuity. CDVA: corrected distant visual acuity. max: maximum keratometry. MRSE: mean refractive spherical equivalent. D: diopter.
