Corneal Collagen Cross-Linking (CXL) Performed With "Epi-ON" Versus "Epi-OFF" in Eyes With Keratoconus and Other Corneal Ectatic Disorders

Keratoconus Clinical Trial

Official title:

Comparison of Corneal Collagen Cross-Linking Performed With "Epi-ON" Versus "Epi-OFF" Techniques in Eyes With Keratoconus and Other Corneal Ectatic Disorders

Clinical Trial Details — Status: Not yet recruiting

Administrative data

• NCT number: NCT03858036
• Other study ID #: CFS-CXL-001
• Status: Not yet recruiting
• Phase: Phase 3
• Start date: March 8, 2019
• Est. completion date: December 31, 2024

Study information

• Verified date: February 2019
• Source: Center for Sight, Sacramento, CA
• Contact: Jasmine Ly, OD
• Phone: 916-446-2020
• Email: jly[@]liangvision.com
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

This is a prospective, randomized, single investigative site study to compare the safety and effectiveness of Epi-OFF CXL treatment (performed using Ricrolin+ and VEGA UV-A system) compared to Epi-ON CXL (performed using Ricrolin+ and VEGA UV-A system) in eyes with keratoconus and other corneal ectatic disorders.Subjects will be randomized to receive the CXL treatment with either the Epi-On or Epi-Off technique.

Recruitment information / eligibility

• Status: Not yet recruiting
• Enrollment: 550
• Est. completion date: December 31, 2024
• Est. primary completion date: December 31, 2024
• Accepts healthy volunteers: No
• Gender: All
• Age group: 12 Years and older

Eligibility

Inclusion Criteria:

1. Be at least 12 years of age or older, male or female, of any race.

2. Having a diagnosis of keratoconus or other corneal ectatic disorder.

3. Presence of central or inferior steepening on the topography map.

4. Axial topography consistent with keratoconus or other corneal ectatic disorder.

5. For eyes diagnosed with keratoconus, presence of one or more slit lamp findings associated with keratoconus, such as:

1. Scissoring of the retinoscopic reflex

2. Fleischer ring

3. Vogt striae

4. Corneal thinning e .Corneal scarring

6. BSCVA 20/20 or worse.

7. Subject is willing to have CXL performed by the Epi-OFF or Epi-ON techniques.

8. Provide written informed consent and a signed HIPPA form. Pediatric subjects less than 14 years of age must sign an assent and a parent or legal guardian must sign an informed consent.

9. Willingness and ability to follow all instructions and comply with schedule for follow-up visits.

10. If female and capable of becoming pregnant, must not be lactating or pregnant and must agree to use a medically acceptable form of birth control for at least one week prior to the treatment visit and to continue o one month following treatment.

Exclusion Criteria:

1. One of the randomized CXL techniques (Epi-OFF or Epi-ON) is contraindicated or, in the investigator's clinical judgment, is not able to be performed in the study eye.

2. Study eye keratoconus severity is classified as being normal or atypical normal based on the OPD-Scan III keratoconus classification indices.

3. A history of previous corneal transplant in the study eye.

4. A history of prior CXL in the study eye.

5. Corneal pachymetry < 375 microns at the thinnest point as measured by ultrasound pachymetry in the study eye before epithelium removal. [NOTE: Eyes with corneal pachymetry between <375 microns and 325 microns may be enrolled in the compassionate use group.]

6. Presence of Intacs or corneal rings or segments in the study eye.

7. Previous ocular condition (other than refractive error) in the eye(s) to be treated that may predispose the eye for future complications or prevent the possibility of improved vision, for example:

1. History of corneal disease (e.g., herpes simplex, herpes zoster keratitis, recurrent erosion syndrome, corneal melt, or corneal dystrophy, etc.)

2. Clinically significant corneal scarring in the treatment zone unrelated to keratoconus.

8. Eyes which are aphakic.

9. Eyes which are pseudophakic and do not have a UV blocking lens implanted.

10. A known contraindication, sensitivity, or allergy to the test article or its components or to study medications.

11. Nystagmus or any other condition that would prevent a steady gaze during the cross-linking treatment or other diagnostic tests.

12. If female, pregnant, nursing or planning a pregnancy, or having a positive urine pregnancy test prior to the randomization of, or treatment of, either eye during the course of the study.

13. A condition that, in the investigator's opinion, would interfere with or prolong epithelial healing, including a history of chemical injury or delayed epithelial healing in the study eye.

14. Presence or history or any other condition or finding that, in the investigator's opinion, makes the patient unsuitable as a candidate for cross-linking or study participation or may confound the outcome of the study.

Related Conditions & MeSH terms

• Ectasia
• Keratoconus

Intervention

Drug:
• Ricrolin+
1 to 2 drops of Ricrolin+ will be instilled topically in the eye every 2 minutes for 30 minutes. At the end of the Ricrolin+ pre-treatment period, the eye will be examined at the slit lamp to detect the presence of a yellow flare in the anterior chamber, indicating adequate riboflavin saturation of the corneal tissue. If the yellow flare is not detected, Ricrolin+ will continue to be instilled 1 drop every 2 minutes for an additional 5 to 10 minutes; and the anterior chamber will be rechecked for yellow flare. This process will be repeated as necessary. During the irradiation period, 1 to 2 drops of Ricrolin+ to cover the cornea (in the same manner as during the riboflavin pre-treatment) before the start of irradiation and every 5 minutes during irradiation until irradiation is complete.

Device:
• VEGA UV-A system
The VEGA light will be administered for 30 minutes. The VEGA light will stop automatically every 5 minutes for Ricrolin+ administration.

Locations

Country	Name	City	State
United States	Center for Sight	Sacramento	California

Sponsors (1)

Lead Sponsor	Collaborator
Center for Sight, Sacramento, CA

Country where clinical trial is conducted

United States, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Mean change in corneal curvature	Percentage of eyes that had a greater than 2D increase in Kmax measured by the OPD-Scan III	Baseline, 6 Months, and 12 Months
Secondary	Change in manifest refraction spherical equivalent	Change in refraction	Baseline, 6 Months, and 12 Months
Secondary	Change in best-corrected visual acuity (BSCVA)	Percentage of eyes that had a loss of 2 or more lines in BSCVA	Baseline, 6 Months, and 12 Months
Secondary	Change in uncorrected-visual acuity (UCVA)		Baseline, 6 Months, and 12 Months
Secondary	Change in thinnest pachymetry	measured by ultrasound	Baseline, 6 Months, and 12 Months