Accelerated Corneal Collagen Crosslinking for Keratoconus and Ectasia Using Pulse or Continuous UV-A Light

Study Overview
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Brief Summary
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Corneal collagen crosslinking has been demonstrated as an effective method of reducing progression of both keratoconus and post-refractive corneal ectasia, as well as decreasing the steepness of the cornea in these pathologies. Performing an accelerated CXL procedure with pulsed UVA light may increase the oxygenation of the cornea, which may improve the crosslinking efficacy.

Detailed Description
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This is a prospective, single-site study to analyze the use of continuous vs pulsed UVA light after removal of the epithelium for the collagen crosslinking procedure for keratoconus and post-refractive corneal ectasia. In the standard crosslinking treatment, the cornea is treated with a continuous UVA light treatment with a power of 3mW/cm2 for 30 minutes. CXL treatment can potentially be performed in a shorter period of time by increasing the power of the UVA light and decreasing the exposure time, while maintaining the same total energy delivered to the cornea. This study will compare the efficacy and safety of accelerated crosslinking using either a continuous or pulsed UVA treatment. One group will be randomized to be treated with 12mW/cm2 of continuous UVA light treatment for 7.5 minutes and the other group will be treated with 12mW/cm2 of pulsed UVA light treatment for 15 minutes. The primary efficacy parameter that will be evaluated over time is maximum keratometry (Kmax) in the randomized eyes for each treatment group. The secondary efficacy parameter is to determine if the two treatment groups are equivalent in their mean Kmax change at 6 months after treatment compared with baseline.

Official Title
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A Randomized Study to Evaluate the Safety and Efficacy of Corneal Collagen Crosslinking Performed With Continuous vs Pulsed UVA Light for Reducing Corneal Curvature in Eyes With Keratoconus and Post-refractive Corneal Ectasia

Conditions
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Keratoconus, Corneal Ectasia

Intervention / Treatment
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* Drug: riboflavin ophthalmic solution
* Drug: riboflavin ophthalmic solution


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: 18 years of age or older having a diagnosis of keratoconus or corneal ectasia after corneal refractive surgery Presence of central or inferior corneal 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 corneal erosion syndrome, corneal melt, corneal dystrophy, etc. Clinically significant scarring in the CXL treatment zone A history of chemical injury or delayed 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 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: 18 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: Continuous UVA<br>Riboflavin administration one drop every two minutes with administration of 12mW/cm2 of continuous UVA light for 7.5 minute exposure time | Drug: riboflavin ophthalmic solution<br>* Administration of riboflavin one drop every 2 minutes during administration of continuous UVA light for 7.5 minutes.<br>|
| Active Comparator: Pulsed UVA<br>Riboflavin administration one drop every two minutes with administration of 12mW/cm2 of pulsed UVA light for 15 minute exposure time | Drug: riboflavin ophthalmic solution<br>* Administration of riboflavin one drop every 2 minutes during administration of pulsed UVA light for 15 minutes<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 6 months | 6 months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Mean keratometry | Determine whether the two treatment groups are equivalent in their mean keratometry (meanK) change at 6 months post treatment compared with baseline. | 6 months | 

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