A randomized controlled trial of corneal collagen cross-linking in progressive keratoconus: preliminary results.

Purpose: This prospective, randomized, controlled trial aims to provide evidence in relation to the efficacy and safety of corneal collagen cross-linking (CXL) in the management of progressive keratoconus.

Methods: Eligible eyes were separately randomized into either treatment or control groups. Collagen crosslinking was performed using 0.