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

Table 2

Group 2 (epi-on): 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)	565.41 ± 31.91	495.45 ± 43.16	0.01
K flat (D)	45.84 ± 2.53	46.44 ± 3.67	0.25
K steep (D)	48.86 ± 3.27	49.75 ± 3.47	0.60
Mean K (D)	47.00 ± 2.79	47.82 ± 4.06	0.10
BCVA (logMAR)	0.32 ± 0.16	0.27 ± 0.13	0.01
OSDI© (before and one-month later)	4.98 ± 1.32	11.26 ± 2.12	0.04

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