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  Indian J Med Microbiol
 

Figure 4: The visual acuity before and after epi-on CXL and epi-off CXL. (a) Uncorrected visual acuity. *Wilcoxon test, the increase of uncorrected visual acuity in epi-off CXL: P = 0.08 at 12 months and P = 0.11 at 18 months and in epi-on CXL: P = 0.27 at 12 months and P = 0.27 at 18 months. †Mann–Whitney U-test, the comparison of epi-on and epi-off CXL in terms of increase of uncorrected visual acuity, P = 0.57 at 18 months. (b) Best-corrected visual acuity with spectacle. *Wilcoxon test, the increase of best-corrected visual acuity in epi-off CXL: P = 0.02 at 12 months and P = 0.01 at 18 months' follow-up and in epi-on CXL: P = 0.04 at 12 months and P = 0.04 at 18 months. †Mann–Whitney U-test, the comparison of epi-on and epi-off CXL in terms of increase of best-corrected visual acuity, P = 0.35 at 18 months. CXL=Corneal collagen cross-linking

Figure 4: The visual acuity before and after epi-on CXL and epi-off CXL. (a) Uncorrected visual acuity. *Wilcoxon test, the increase of uncorrected visual acuity in epi-off CXL: <i>P</i> = 0.08 at 12 months and <i>P</i> = 0.11 at 18 months and in epi-on CXL: <i>P</i> = 0.27 at 12 months and <i>P</i> = 0.27 at 18 months. †Mann–Whitney U-test, the comparison of epi-on and epi-off CXL in terms of increase of uncorrected visual acuity, <i>P</i> = 0.57 at 18 months. (b) Best-corrected visual acuity with spectacle. *Wilcoxon test, the increase of best-corrected visual acuity in epi-off CXL: <i>P</i> = 0.02 at 12 months and <i>P</i> = 0.01 at 18 months' follow-up and in epi-on CXL: <i>P</i> = 0.04 at 12 months and <i>P</i> = 0.04 at 18 months. †Mann–Whitney U-test, the comparison of epi-on and epi-off CXL in terms of increase of best-corrected visual acuity, <i>P</i> = 0.35 at 18 months. CXL=Corneal collagen cross-linking