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Table 1 Comparison of visual acuities and corneal topographic findings between the two groups

From: Different accelerated corneal collagen cross-linking treatment modalities in progressive keratoconus

   Group 1 (n = 37) Group 2 (n = 29) P
UCVA (LogMAR) Preop 0.581 ± 0.341 0.662 ± 0.277 0.213
12-month postop 0.449 ± 0.293 0.572 ± 0.299 0.059
Mean change 0.13 ± 0.22 0.09 ± 0.21 0.510
P* 0.001 0.031  
BCVA (LogMAR) Preop 0.378 ± 0.237 0.421 ± 0.206 0.281
12-month postop 0.281 ± 0.185 0.283 ± 0.161 0.936
Mean change 0.10 ± 0.13 0.14 ± 0.15 0.137
P* 0.0001 0.0001  
Cyl (D) Preop 3.46 ± 1.49 3.51 ± 1.54 0.899
12-month postop 3.48 ± 1.67 3.51 ± 1.75 0.937
Mean change −0.02 ± 0.57 0.00 ± 0.62 0.902
P* 0.862 0.986  
Thin (μm) Preop 463.51 ± 38.74 458.72 ± 37.11 0.613
12-month postop 443.51 ± 46.79 418.14 ± 43.35 0.027
Mean change 20.00 ± 20.76 40.59 ± 25.45 0.0001
P* 0.0001 0.0001  
Vol (mm3) Preop 56.62 ± 3.56 55.87 ± 4.15 0.434
12-month postop 55.58 ± 3.93 54.59 ± 4.29 0.331
Mean change 1.03 ± 1.62 1.28 ± ± .75 0.561
P* 0.0001 0.018  
CCT (μm) Preop 482.16 ± 39.52 474.1 ± 38.82 0.410
12-month postop 471.05 ± 46.19 451.59 ± 41.84 0.081
Mean change 11.11 ± 18.64 22.52 ± 21.42 0.008
P* 0.001 0.0001  
  1. UCVA = uncorrected visual acuity; BCVA = best-corrected visual acuity; Cyl = topographic cylindrical value; Thin = thinnest point of cornea; Vol = corneal volume; CCT = central corneal thickness; D = diopters
  2. P: Paired t-test; P*: Student’s t-test; Values in bold are significant (P < 0.05)