- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT01901601
LALAK for Opacities
Randomized Clinical Trial of OCT-Guided Laser-Assisted Lamellar Anterior Keratoplasty in Adults for Stromal Opacities
The purpose of this protocol is to compare and develop new surgical technique of partial-thickness corneal transplantation for treating corneal opacity. A newly developed technique, "dovetail" laser-assisted lamellar anterior keratoplasty (LALAK), will be tested and compared with standard full-thickness corneal transplantation, Intralase-enabled keratoplasty (IEK). The new LALAK technique replaces only the front portion of the cornea and does not have the risks associated with conventional IEK. Additionally, optical coherence tomography (OCT) will be used to guide the depth of the graft and donor dissections.
The data will be analyzed to understand whether the new technique (LALAK) can repeatedly achieve good visual outcomes with lower risk from the operation compared to the visual outcomes and risk associated with the current standard of care, IEK.
Study Overview
Status
Conditions
Study Type
Phase
- Not Applicable
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Eyes with corneal opacities that cannot be adequately or safely corrected with spectacles, contact lens or excimer laser surface ablation. The cornea must have healthy endothelium (endothelial cell density > 1,500/mm2).
Exclusion Criteria:
- Preoperative corneal thickness less than 400 microns.
- Inability to give informed consent.
- Corneal edema
- Central guttata
- Inability to maintain stable fixation for OCT imaging.
- Inability to commit to required visits to complete the study.
- Eyes with concurrent cataract, retinal diseases, glaucoma, or other eye conditions that may limit the visual outcome after surgery.
- Patients with severe collagen vascular diseases or ocular surface disorders
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: Randomized
- Interventional Model: Single Group Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: LALAK
laser-assisted lamellar anterior keratoplasty.
Optical Coherence Tomography, femtosecond laser, topical anesthesia, and Retrobulbar Block or General Anesthesia will be used.
|
The femtosecond laser system to be used in this study for host cornea preparation will be the Intralase FS system (iFS, AMO, Inc., Santa Ana, CA).
The iFS is FDA-approved for corneal surgery including full thickness and lamellar keratoplasty.
Eye banks use earlier versions of the Intralase system which are also FDA approved for this indication.
OCT will be used to guide the depth of the graft and donor dissections.
The OCT systems to be used in this study will be the RTVue (Optovue, Inc., Fremont, CA) or the Visante (Carl Zeiss Meditec, Inc., Dublin, CA).
Both are FDA-approved for the mapping of corneal thickness.
|
Active Comparator: IEK
Intralase-enabled keratoplasty.
Femtosecond laser and Retrobulbar Block or General Anesthesia will be used.
|
The femtosecond laser system to be used in this study for host cornea preparation will be the Intralase FS system (iFS, AMO, Inc., Santa Ana, CA).
The iFS is FDA-approved for corneal surgery including full thickness and lamellar keratoplasty.
Eye banks use earlier versions of the Intralase system which are also FDA approved for this indication.
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
BSCVA (Snellen chart)
Time Frame: 24 months
|
A primary outcome measures will be BSCVA (Snellen chart)
|
24 months
|
intraoperative perforation rate
Time Frame: 24 months
|
A primary outcome measure will be intraoperative perforation rate.
|
24 months
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
postoperative refractive error
Time Frame: 24 months
|
A secondary outcome measures will be postoperative refractive error
|
24 months
|
topographic astigmatism
Time Frame: 24 months
|
A secondary outcome measures will be topographic astigmatism
|
24 months
|
interface clarity
Time Frame: 24 months
|
A secondary outcome measures will be interface clarity (masked OCT and confocal microscopy grading)
|
24 months
|
endothelial cell count
Time Frame: 24 months
|
A secondary outcome measures will be endothelial cell count (specular microscopy)
|
24 months
|
complications
Time Frame: 24 months
|
A secondary outcome measures will be complications (rejection, interface opacification, others).
|
24 months
|
Collaborators and Investigators
Investigators
- Principal Investigator: Winston Chamberlain, MD, PhD, Casey Eye Institute, Oregon Health & Science University
Publications and helpful links
Helpful Links
Study record dates
Study Major Dates
Study Start
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- OHSU IRB#00009282
- R01EY018184 (U.S. NIH Grant/Contract)
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
Clinical Trials on STROMAL OPACITIES
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Oregon Health and Science UniversityNational Eye Institute (NEI)RecruitingCorneal Opacities (Scar and Stromal Dystrophy)United States
-
Augenabteilung Allgemeines Krankenhaus LinzUnknownOther Vitreous Opacities, BilateralAustria
-
Memorial Sloan Kettering Cancer CenterM.D. Anderson Cancer Center; Mayo Clinic; Washington University School of Medicine and other collaboratorsActive, not recruitingMultiple Ground Glass Opacities (GGOs)United States, Canada
-
Fudan UniversityRecruitingLung Ground-glass Opacities | Watchful WaitingChina
-
PulseMedicaRecruiting
-
Cutting Edge SAStargomedGmbHRecruitingCataract | Lens OpacitiesSingapore, Spain, Czechia, Germany, Philippines, Austria
-
PulseMedicaNot yet recruiting
-
Beaver-Visitec International, Inc.targomedGmbHRecruitingCataract | Lens OpacitiesSwitzerland
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Cutting Edge SAStargomedGmbHRecruitingCataract | Lens OpacitiesSpain, Czechia
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Beaver-Visitec International, Inc.CompletedCataract | Lens OpacitiesBelgium
Clinical Trials on LALAK
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Oregon Health and Science UniversityNational Eye Institute (NEI); National Institutes of Health (NIH)Terminated
-
Oregon Health and Science UniversityNational Eye Institute (NEI); National Institutes of Health (NIH)Terminated