Transepithelial (Epi-on) Corneal Collagen Crosslinking to Treat Keratoconus and Corneal Ectasia

Study Overview
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Brief Summary
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Corneal collagen crosslinking (CXL) has been demonstrated as an effective method of reducing progression of both keratoconus and corneal ectasia after surgery, as well as possibly decreasing the steepness of the cornea in these pathologies. Transepithelial crosslinking in which the epithelium is not removed has been proposed to offer a number of advantages over traditional crosslinking including an increased safety profile by reducing the risk for infection and scarring, faster visual recovery and improved patient comfort in the early postoperative healing period.

Detailed Description
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The objective of this randomized study is to investigate the difference between two regimens of transepithelial crosslinking. The study will compare two riboflavin dosing regimens during the crosslinking procedure. The primary objective of this study is to evaluate the safety and efficacy of transepithelial corneal collagen crosslinking performed with two different riboflavin administration protocols during the UVA portion of the procedure. Safety and efficacy outcomes will then be compared between the treatment groups. In particular, the two groups will be compared with regard to their efficacy in reducing corneal curvature. Secondary outcomes will include visual acuity. Safety assessments will include a tabulation of adverse events, patient symptoms, loss of visual acuity, changes in endothelial cell density, and slit lamp examination.

Official Title
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Randomized Study of Safety and Effectiveness of Corneal Collagen Crosslinking Using Two Different Riboflavin Administration Protocols

Conditions
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Keratoconus, Corneal Ectasia

Intervention / Treatment
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* Drug: Riboflavin
* Drug: Riboflavin


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: 12 years of age or older Having a diagnosis of keratoconus or corneal ectasia after corneal refractive surgery (e.g., LASIK, photorefractive keratectomy [PRK]) Presence of central or inferior steepening on the Pentacam map Axial topography consistent with keratoconus or post-surgical corneal ectasia Contact lens wearers only: Removal of contact lenses for the required period of 1 week prior to the screening refraction Signed written informed consent Willingness and ability to comply with schedule for follow-up visits Exclusion Criteria: Eyes classified as either normal, atypical normal, or keratoconus suspect on the severity grading scheme Corneal pachymetry measuring 300 microns or less at the thinnest point measured by Pentacam in the eye(s) to be treated Previous ocular condition (other than refractive error) in the eye(s) to be treated that may predispose the eye for future complications, for example: History of corneal disease (e.g., herpes simplex, herpes zoster keratitis, recurrent erosion syndrome, corneal melt, corneal dystrophy, etc.) Clinically significant corneal scaring in the CXL treatment zone A history of chemical injury or delayed epithelial healing in the eye(s) to be treated Pregnancy (including plan to become pregnant) or lactation during the course of the study A known sensitivity to study medications Patients with nystagmus or any other condition that would prevent a steady gaze during the CXL treatment or other diagnostic tests Patients with a current condition that,in the investigator's opinion, would interfere with or prolong epithelial healing

Ages Eligible for Study
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Minimum Age: 12 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Riboflavin drop every 2 minutes<br>Administration of one drop of Riboflavin every 2 minutes during UV exposure | Drug: Riboflavin<br>* Administration of riboflavin one drop every 10 minutes during UVA exposure<br>|
| Active Comparator: Riboflavin drop every 10 minutes<br>Administration of one drop of Riboflavin every 10 minutes during UV exposure | Drug: Riboflavin<br>* Administration of riboflavin one drop every 2 minutes during UVA exposure<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Maximum keratometry | The change in maximum keratometry (Kmax) from baseline will be evaluated at 12 months for all eyes randomized in group 1 and group 2. | 12 months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Mean keratometry | The change in mean keratometry (Mean K) from baseline will be evaluated at 12 months for all eyes randomized in group 1 and group 2. | 1 year | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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keratoconus, corneal ectasia, collagen crosslinking, riboflavin, crosslinking, corneal crosslinking