Epi-Off versus Epi-On Corneal Collagen Cross-Linking in Keratoconus Patients: A Comparative Study through 2-Year Follow-Up

Table 1

Group 1 (epi-off): comparison of analyzed parameters (mean ± SD) before and after treatment at the end of the follow-up (2 years).

	Preoperative	Postoperative	value
Mean corneal thickness (µm)	556.45 ± 23.56	501.41 ± 21.91	0.01
K flat (D)	44.62 ± 2.63	44.71 ± 3.03	0.33
K steep (D)	47.75 ± 3.20	47.76 ± 3.47	0.10
Mean K (D)	46.19 ± 2.82	46.16 ± 3.15	0.57
BCVA (logMAR)	0.36 ± 0.14	0.22 ± 0.12	0.01
OSDI© (before and one-month later)	4.85 ± 1.18	13.56 ± 2.15	0.01

BCVA: best corrected visual acuity; OSDI: Ocular Surface Disease Index; Student’s t-test for paired values.