Collagen Crosslinking for Keratoconus - a Randomized Controlled Clinical Trial
Collagen Crosslinking for Keratoconus - a Randomized Controlled Clinical Trial
The purpose of this study is to determine whether corneal collagen crosslinking is effective in the treatment of progressive keratoconus.
Keratoconus is a noninflammatory, asymmetrical, progressive corneal ectasia caused by biomechanical instability of the corneal stroma. Treatment modalities are primarily glasses or contact lenses. It has been estimated that one out of five patients will progress to such an extent that a corneal transplant is necessary to regain useful vision.
Corneal collagen crosslinking (CXL) is a treatment modality that intends to halt progression of keratoconus. This study investigates the efficacy av CXL in stabilizing the cornea in keratoconus by means of a randomized controlled clinical trial.
Participants are eligible for inclusion if progressive keratoconus is confirmed and the inclusion criteria are met. Follow-up after inclusion is at 1 week (treatment group), 1, 3, 6 and 12 months. Pre- and post-inclusion examinations include measurement of uncorrected distance visual acuity (UCDVA), best spectacle corrected distance visual acuity (BSCDVA), Scheimpflug-topography and slitlamp examination.
Inclusion Criteria:
Keratoconus diagnosis determined clinically and topographically (KISA%- index)
Significant progression is defined as change (increase) of Kmax by at least
1D from baseline at 6 months and/or change (increase) of Sim-K-ast by at least 1D from baseline at 6 months. Kmax is defined as the steepest radius of curvature (either the maximum simulated K-reading or the maximum K-reading in the 3-mm zone or the 5-mm zone) of the anterior corneal surface that progressed the most during 6 months observation
Ability to stop contact lens (rigid and soft) wear at least two weeks prior to next exam
Signed written informed consent
Exclusion Criteria:
Relative exclusion criteria: