Safety and Effectiveness of the UV-X System for Corneal Collagen Cross-Linking for Compassionate Treatment in Pediatric Patients With Progressive Keratoconus

Inclusion Criteria: * Age 6 to 18 years * Having a diagnosis of progressive keratoconus * Signed written informed consent * Having a condition that limits the patient's capacity to comply with the cross-linking treatment procedures and/or the diagnostic tests and measurements required by the ongoing clinical studies * Willingness and ability to comply with schedule for follow-up visits Exclusion Criteria: * Corneal pachymetry at the screening exam that is \<400 microns at the thinnest point * Previous ocular condition in the eye(s) to be treated that may predispose the eye for future complications, for example (herpes simplex, herpes zoster keratitis, recurrent erosion syndrome, corneal melt, or corneal dystrophy, etc.) * A history of delayed epithelial healing in the eye(s) to be treated * Pregnancy or lactation during the course of the study * A known sensitivity to study medications