Clinical trial NCT02762253: Study of the Safety and Effectiveness of Photochemically Induced Collagen Cross-Linking in Eyes With Keratoconus.
Official title: Study of the Safety and Effectiveness of Photochemically Induced Collagen Cross-Linking at an Irrandiance of 18 mW/cm2 in Eyes With Keratoconus or Ectasia.
Study type: INTERVENTIONAL
Overall status: TERMINATED
Phase: PHASE2
Conditions: Keratoconus
Lead sponsor: Nvision Laser Eye Centers
Sponsor class: INDUSTRY
First posted: 2016-05-04
Enrollment: 320
Sex: ALL
Minimum age (years): 12
Standard ages: CHILD
ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: NA
Intervention model: SINGLE_GROUP
Primary purpose: TREATMENT

Brief summary: This study is being conducted to assess the safety and effectiveness of photochemically induced collagen cross- linking (CCL) at irradiance of 18mW/cm2 in eyes with Keratoconus and Ecstasia.

Detailed description: Riboflavin drops are used every 2 minutes for 30+ minutes until the corneal stroma is saturated with Riboflavin as evidenced by observing Riboflavin in the Anterior chamber. Two arms in the study, one uses Riboflavin with Epithelium on and the other with Epithelium off. Once it is observed that the Riboflavin has penetrated the stroma and is seen in the anterior chamber, the cornea is exposed to Ultraviolet light at an irradiance level of 18mW/cm2 for 5 minutes. A contact lens is applied until the epithelium has fully healed in 3 to 5 days. The study is for 6 months. The corneal curvature as well as the uncorrected and best corrected vision and corneal thickness are evaluated pre-operatively and at 6 months. The primary variable that is assessed to determine the efficacy of the drug is the Kmax - Steep corneal curvature. Secondary effectiveness criteria are uncorrected and best corrected vision and corneal thickness. adverse events are also monitored.

Eligibility criteria: INCLUSION CRITERIA GENERAL:

1. 12 years of age or older
2. Signed written informed consent
3. Willingness and ability to comply with schedule for follow-up visits
4. Contact lens removal prior to evaluation and treatment
5. Candidates must also have two of the following criteria:

   1. Presence of central or inferior steepening on the Pentacam or Orbscan map consistent with Keratoconus.
   2. Axial topography consistent with keratoconus.
   3. Steepest keratometry (Kmax) value of 47.00D

INCLUSION CRITERIA FOR ECTASIA:

History of having undergone a keratorefractive procedure and 2 of the following criteria:

1. Steepening by topography, either Pentacam or Orbscan
2. Thinning of cornea
3. Shift in the position of thinnest portion of cornea
4. Change in refraction with increasing myopia
5. Development of myopic astigmatism
6. Development of irregular astigmatism
7. Loss of BSCVA

   EXCLUSION CRITERIA:

   I. Eyes classified as either normal or atypical normal 2. Corneal pachymetry 350 microns at the thinnest point measured by Pentacam in the eye to be treated 3. A history of chemical injury or delayed epithelial healing in the eye to be treated.

   4. Pregnancy (including plan to become pregnant) or lactation during the course of the study 5. A known sensitivity to study medications 6. Patients with nystagmus or any other condition that would prevent a steady gaze during the treatment 7. Inability to cooperate with diagnostic tests. 8. Patients with a concomitant condition that, in the investigator's opinion, would interfere with or prolong epithelial healing.

   9. Taking Vitamin C (ascorbic acid) supplements within 1 week of the cross-linking treatment.

   10. Patients who are unable to remain supine and tolerate a lid speculum for an extended period of time.

   -

Primary outcomes:
measure: Keratometry
timeFrame: 6 months
Secondary outcomes:
measure: manifest refraction
timeFrame: 6 months
measure: Visual Acuity
timeFrame: 6 months
measure: Central Pachymetry
timeFrame: 6 months
Other outcomes:
Locations:
city: Camarillo
country: United States
facility: NVISION Camarillo
state: California
city: Citrus Heights
country: United States
facility: NVISION Sacramento
state: California
city: Fullerton
country: United States
facility: NVISION Fullerton
state: California
city: Laguna Hills
country: United States
facility: NVISION Laguna Hills
state: California
city: Newport Beach
country: United States
facility: NVISION Newport Beach
state: California
city: Ontario
country: United States
facility: NVISION Ontario
state: California
city: San Diego
country: United States
facility: NVISION La Jolla
state: California
city: Sherman Oaks
country: United States
facility: Berg Feinfield Vision Center
state: California
city: Torrance
country: United States
facility: NVISION Torrance
state: California
city: Las Vegas
country: United States
facility: NVISION Las Vegas
state: Nevada
city: Beaverton
country: United States
facility: Teplick Custom Vision
state: Oregon
Study officials:
affiliation: NVISION Eye Centers
name: tom s tooma, md
role: PRINCIPAL_INVESTIGATOR
References: