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

Inclusion Criteria:

1. Be at least 18 years of age, male or female, of any race;
2. Provide written informed consent and sign a HIPAA form;
3. Willingness and ability to follow all instructions and comply with schedule for studyvisits;
4. Have a diagnosis of corneal ectasia post-refractive surgery (such as LASIK, PRK);
5. Planning to undergo (or have undergone within the past 90 days) corneal collagencross-linking with PHOTREXA VISCOUS/ PHOTREXA and the KXL System, per the prescribinginformation (NOTE: Complete treatment and follow-up data, including anyproduct-related events at time of procedure through the time of enrollment must beavailable);
6. For females capable of becoming pregnant, agree to have urine pregnancy testingperformed prior to enrolling in the registry; must not be pregnant or lactating.

Exclusion Criteria:

1. If female, be pregnant, nursing, or have a positive urine pregnancy test prior toenrollment in the registry;
2. The Investigator may exclude or discontinue any patient for any sound medical reason.