Transepithelial Diluted Alcohol and Iontophoresis-Assisted Corneal Crosslinking for Progressive Keratoconus in Adults: 4-Year Clinical Results

imagePurpose:

The aim of this study was to compare the 4-year clinical outcomes of transepithelial diluted alcohol and iontophoresis-assisted corneal crosslinking (DAI-CXL) and standard corneal crosslinking (S-CXL) in adults with progressive keratoconus.

Methods:

This retrospective study included 36 eyes of 36 keratoconic patients who underwent DAI-CXL (n = 18) or S-CXL (n = 18). Best spectacle-corrected visual acuity (BSCVA) and corneal topography parameters were analyzed at baseline and at 1, 2, 3, and 4 years of follow-up. Corneal demarcation line depth (DLD) at 1 month was measured, and the relation of DLD with corneal thickness (DL%) was assessed.

Results:

BSCVA improved significantly only in S-CXL (P = 0.01). A significant decrease in maximum keratometry and mean keratometry occurred at 4 years in both groups (all P 0.05). There was a significant reduction in the thinnest corneal thickness in S-CXL (P = 0.01); however, the mean thinnest corneal thickness in DAI-CXL remained stable (P = 0.094). Higher-order aberrations and coma aberration decreased significantly in both groups at 4 years (all P 0.05).

Conclusions:

DAI-CXL was as effective as S-CXL in arresting the progression of keratoconus and showed similar clinical results to S-CXL at the 4-year follow-up.