- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT02806921
Changes in the Tear Film With Scleral Contact Lens Wear for Keratoconic Eyes
June 25, 2019 updated by: Luigina Sorbara, University of Waterloo
Protease and Cytokine Composition in Post Lens Tear Reservoir of Scleral Lenses for Keratoconic Eyes
The purpose of this study is to investigate changes in the level of inflammatory mediators in the tear film of scleral contact lens wearers in a keratoconic population.
Study Overview
Detailed Description
Scleral contact lenses are rigid gas permeable lenses designed to rest on the sclera while vaulting over the cornea with a fluid reservoir.
The use of scleral contact lenses has become the current standard of practice as a nonsurgical management of corneal ectasia and ocular surface diseases.
Cases have been recently presented of scleral lens wearers exhibiting adverse corneal findings and conjunctival injection from lens wear.
These findings are likely associated with the mechanical and hypoxic effects due to poor fitting characteristics at the limbal area.
Tear film analysis detecting changes in the levels of proteinases and cytokines have helped researchers gain a better understanding of the pathophysiology of complications in soft contact lenses wearers, dry eye, and keratoconus.
Ultimately, this study will provide insights in relating scleral lens fitting characteristics and corneal and limbal physiological responses.
Study Type
Interventional
Enrollment (Actual)
13
Phase
- Not Applicable
Participation Criteria
Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.
Eligibility Criteria
Ages Eligible for Study
18 years and older (ADULT, OLDER_ADULT)
Accepts Healthy Volunteers
Yes
Genders Eligible for Study
All
Description
Inclusion Criteria:
- Had been diagnosed with keratoconus in at least one eye.
- Is at least 18 years of age and has full legal capacity to volunteer.
- Has read and understood the information consent letter.
- Is willing and able to follow instructions and maintain the appointment schedule.
Exclusion Criteria:
- Is using any topical medications that will affect ocular health.
- Has any ocular pathology or severe insufficiency of lacrimal secretion (severe dry eyes) that would affect the wearing of contact lenses.
- Has persistent, clinically significant corneal or conjunctival staining using sodium fluorescein dye.
- Has any clinically significant lid or conjunctival abnormalities and active neovascularization.
- Is aphakic.
- Has undergone any corneal surgery.
- Is participating in any other type of eye related clinical or research study.
- Has any known allergies or sensitivity to the diagnostic pharmaceuticals or products, such as fluorescein, used in this study.
Study Plan
This section provides details of the study plan, including how the study is designed and what the study is measuring.
How is the study designed?
Design Details
- Primary Purpose: TREATMENT
- Allocation: RANDOMIZED
- Interventional Model: CROSSOVER
- Masking: DOUBLE
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
ACTIVE_COMPARATOR: ZenLens with Low limbal clearance
Scleral contact lens designed to provide approximately 25 microns of limbal clearance.
|
The ZenLens™ semi-scleral lenses are manufactured by Alden Optic Laboratories Inc., Lancaster, NY.
They will be made in Boston XO material.
|
ACTIVE_COMPARATOR: ZenLens with High limbal clearance
Scleral contact lens designed to provide approximately 80 microns of limbal clearance.
|
The ZenLens™ semi-scleral lenses are manufactured by Alden Optic Laboratories Inc., Lancaster, NY.
They will be made in Boston XO material.
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Tear Protein
Time Frame: 2 weeks of lens wear with daily schedule of 6-8 hours.
|
To measure the level proteases and cytokines in each of the samples using Meso Scale Discovery system (MSD-ECL).
|
2 weeks of lens wear with daily schedule of 6-8 hours.
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Comfort
Time Frame: 2 weeks of lens wear with daily schedule of 6-8 hours.
|
Participants will be asked to rate their ocular comfort, dryness, burning and vision with the contact lenses.
|
2 weeks of lens wear with daily schedule of 6-8 hours.
|
Bulbar and limbal hyperemia
Time Frame: 2 weeks of lens wear with daily schedule of 6-8 hours.
|
The eyes of the participants will be imaged using the Keratograph® 5.
|
2 weeks of lens wear with daily schedule of 6-8 hours.
|
Corneal thickness
Time Frame: 2 weeks of lens wear with daily schedule of 6-8 hours.
|
Their corneal thickness will be measured with the Visante OCT.
|
2 weeks of lens wear with daily schedule of 6-8 hours.
|
Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Sponsor
Collaborators
Study record dates
These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.
Study Major Dates
Study Start (ACTUAL)
August 1, 2016
Primary Completion (ACTUAL)
January 30, 2018
Study Completion (ACTUAL)
February 15, 2018
Study Registration Dates
First Submitted
June 16, 2016
First Submitted That Met QC Criteria
June 16, 2016
First Posted (ESTIMATE)
June 21, 2016
Study Record Updates
Last Update Posted (ACTUAL)
June 27, 2019
Last Update Submitted That Met QC Criteria
June 25, 2019
Last Verified
June 1, 2019
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- 14620
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
NO
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 Keratoconus
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The Cleveland ClinicUniversity of MarylandEnrolling by invitationKeratoconus | Keratoconus, Unstable | Keratoconus, StableUnited States
-
Eye Hospital Pristina KosovoActive, not recruitingKeratoconus | Keratoconus of Right Eye | Keratoconus, Unstable, Right EyeKosovo
-
Tianjin Eye HospitalRecruitingScansys, Pentacam, Keratoconus, Subclinical KeratoconusChina
-
Tianjin Eye HospitalActive, not recruitingScansys, Pentacam, Corvis ST, Keratoconus, Subclinical KeratoconusChina
-
Heba Allah Nashaat MohamedAssiut UniversityRecruitingKeratoconus, CollagenEgypt
-
Kent Wellish MDNot yet recruitingKeratoconus, Unstable
-
Kasr El Aini HospitalUnknownProgressive KeratoconusEgypt
-
Centre Hospitalier Régional Metz-ThionvilleCompletedProgressive Keratoconus
-
Glaukos CorporationCompletedProgressive KeratoconusUnited States
-
Tianjin Eye HospitalCompletedKeratoconus, StableChina
Clinical Trials on ZenLens
-
University of WaterlooBausch & Lomb IncorporatedUnknown
-
London South Bank UniversityCompletedKeratoconus | Irregular Astigmatism | Irregular; Contour of Cornea | Pellucid Marginal Corneal Degeneration | Injury of CorneaUnited Kingdom