Observational Registry to Assess the Durability of Effect of CXL in Patients With Corneal Ectasia After Refractive Surgery

Study Overview
=================
Brief Summary
-----------------
The objectives of this post market registry are to evaluate the safety and durability of treatment effect up to 3 years following cross-linking performed with Photrexa Viscous (riboflavin 5'- phosphate in 20% dextran ophthalmic solution), Photrexa (riboflavin 5'- phosphate ophthalmic solution), and the KXL System in patients with corneal ectasia following refractive surgery.

Detailed Description
-----------------
Approximately 200 patients who are planning to undergo or have undergone CXL for the treatment of corneal ectasia following refractive surgery in one or both eyes according to the prescribing information in the Photrexa Viscous and Photrexa Package Insert could be enrolled. Patients will be followed for safety and effectiveness at Months 3, 6, 12, 24 and 36 following cross-linking treatment.

Official Title
-----------------
A Phase IV Observational Registry to Assess the Safety and Durability of Effect of Corneal Collagen Cross-linking With Photrexa Viscous, Photrexa, and the KXL System in Patients With Corneal Ectasia Following Refractive Surgery

Conditions
-----------------
Corneal Ectasia

Intervention / Treatment
-----------------
* Combination Product: Corneal Collagen Cross-linking


Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion Criteria: Be at least 18 years of age, male or female, of any race; Provide written informed consent and sign a HIPAA form; Willingness and ability to follow all instructions and comply with schedule for study visits; Have a diagnosis of corneal ectasia post-refractive surgery (such as LASIK, PRK); Planning to undergo (or have undergone within the past 90 days) corneal collagen cross-linking with PHOTREXA VISCOUS/ PHOTREXA and the KXL System, per the prescribing information (NOTE: Complete treatment and follow-up data, including any product-related events at time of procedure through the time of enrollment must be available); For females capable of becoming pregnant, agree to have urine pregnancy testing performed prior to enrolling in the registry; must not be pregnant or lactating. Exclusion Criteria: If female, be pregnant, nursing, or have a positive urine pregnancy test prior to enrollment in the registry; The Investigator may exclude or discontinue any patient for any sound medical reason.

Ages Eligible for Study
-----------------
Minimum Age: 18 Years

Sexes Eligible for Study
-----------------
All

Accepts Healthy Volunteers
-----------------
No

Study Plan
=================
How is the study designed?
-----------------

Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| CXL Group<br>Patients with corneal ectasia following refractive surgery who had corneal collagen cross-linking in one or both eyes according to the Photrexa Viscous and Photrexa prescribing information | Combination Product: Corneal Collagen Cross-linking<br>* Photrexa Viscous (riboflavin 5'-phosphate in 20% dextran ophthalmic solution), Photrexa (riboflavin 5'-phosphate ophthalmic solution), and the KXL System (UV Irradiation).<br>|

What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Kmax | Change from pretreatment baseline in maximum corneal curvature | 36 months | 
| BCVA | Change from pretreatment baseline in BCVA | 36 month |