Research Article
Preliminary Characterization of Predictive Factors of the Visual Change after Epi-On and Epi-Off Corneal Collagen Crosslinking Techniques
Table 2
Differences between the epi-on and epi-off groups in the visual and refractive parameters in the different visits of the follow-up.
| Mean (SD)
Median (Range) | Preoperative | -value | Postoperative 3 months | -value | Postoperative 12 months | -value | | Epi-on | Epi-off | Epi-on | Epi-off | Epi-on | Epi-off |
| | UDVA (logMAR) | 0.75 (0.44) | 0.75 (0.38) | 0.741 | 0.67 (0.42) | 0.73 (0.40) | 0.620 | 0.65 (0.36) | 0.66 (0.42) | 0.993 | | | 0.7 (1.90) | 0.82 (1.25) | | 0.82 (1.25) | 0.70 (1.25) | | 0.70 (1.25) | 0.61 (1.30) | | | Sphere (D) | −0.75 (1.70) | −1.58 (3.14) | 0.166 | −0.67 (2.11) | −1.53 (3.36) | 0.396 | −0.73 (1.78) | −1.57 (2.94) | 0.366 | | | 0.00 (8.00) | −0.75 (16.00) | | 0.00 (0.75) | −0.50 (17.00) | | −0.13 (9.00) | −0.68 (14.00) | | | Cylinder (D) | −3.35 (1.75) | −3.01 (1.50) | 0.584 | −2.61 (2.08) | −2.35 (1.75) | 0.983 | −2.74 (1.96) | −2.39 (1.59) | 0.542 | | | −3.00 (8.00) | −3.00 (5.50) | | −2.00 (8.00) | −2.50 (6.00) | | −2.50 (9.25) | −2.37 (7.00) | | | SE (D) | −2.42 (1.95) | −3.09 (3.13) | 0.384 | −1.98 (2.41) | −2.71 (3.57) | 0.335 | −2.11 (2.11) | −2.77 (3.22) | 0.170 | | | −2.00 (9.50) | −2.37 (15.63) | | −1.25 (10.75) | −1.63 (18.50) | | −1.62 (11.13) | −1.70 (17.00) | | | J0 (D) | −0.02 (1.34) | −0.21 (1.26) | 0.485 | −0.39 (1.24) | −0.31 (1.08) | 0.917 | −0.25 (1.30) | −0.21 (0.95) | 0.998 | | | 0.00 (5.45) | −0.23 (4.52) | | −0.62 (6.35) | −0.21 (4.95) | | −0.50 (6.35) | −0.21 (3.87) | | | J45 (D) | 0.17 (1.35) | 0.17 (1.11) | 0.772 | 0.05 (1.06) | 0.10 (0.95) | 0.706 | 0.19 (1.12) | 0.33 (1.02) | 0.505 | | | 0.00 (5.93) | −0.16 (3.80) | | 0.00 (4.50) | 0.00 (3.96) | | 0.04 (4.74) | 0.16 (4.97) | | | CDVA (logMAR) | 0.36 (0.23) | 0.33 (0.28) | 0.322 | 0.31 (0.23) | 0.27 (0.15) | 0.630 | 0.28 (0.23) | 0.16 (0.14) | 0.072 | | | 0.30 (1.00) | 0.30 (1.30) | | 0.30 (0.70) | 0.30 (0.70) | | 0.26 (0.82) | 0.15 (0.52) | |
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UDVA, uncorrected distance visual acuity; logMAR, logarithm of minimal angle of resolution; SD, standard deviation; SE, spherical equivalent; CDVA, corrected distance visual acuity; J0 and J45, astigmatism power vectors; D, diopters.
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