- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT03647046
Custom Anterior Surfacing of Scleral Lens for Vision Quality Improvement in Patients With Keratoconus
Study Overview
Detailed Description
This study will be a single center, double-masked collection of data taking place at the Flaum Eye Institute. Informed consent will be obtained from all subjects after a thorough explanation of the nature and possible risks of the study. Flaum Eye Institute electronic health records of existing patients will first be screened by an optometrist or ophthalmologist to verify that they do not fall under the exclusion criteria. Some study communication regarding scheduling will be done over the phone or email. The screening will be similar to a standard eye exam (without eye dilation) and will include a slit lamp examination as well as visual acuity and basic vision evaluation.
The study eye will be chosen based on inclusion criteria; if both eyes qualify, the eye with worse best corrected acuity will be chosen. A new lens will be manufactured for the subject after the screening visit and will be given to the subject during the following study visit. This is done to ensure fully neutralized spherical refractive effort and positional stability. If screening evaluation reveals that the current lens does not fully neutralize spherical refractive error or that the current lens is not positionally stable, a baseline lens will be manufactured that corrects this. The subject will be allowed to keep the old lens if he or she so chooses.
At the second visit, the patient's vision and fit will be evaluated with the optimized baseline BSS lens. Visual acuity and device fit will be evaluated and recorded. If the BSS device fit is still not optimized, then a new device will be made , and the second visit evaluation will be rescheduled. Once the baseline lens design is determined to be satisfactory, the patient will have their wavefront aberration measured with a wavefront sensor. Investigators will dilate the pupil pharmacologically with phenylephrine (2.5%) and tropicamide (1%) and take wavefront measurements of the optical aberrations of the subject's eye wearing the baseline lens using a portable, non-invasive wavefront analyzer designed to measure highly aberrated eyes (Ovitz, P10/EyeProfiler). The investigators will then design and manufacture a study lens that is identical in design to the baseline BostonSight BSS lens except for a custom front surface designed to neutralize the optical aberrations measured with the wavefront analyzer. This HOA-optimized lens will be created prior to the third visit.
At the third visit the patient's vision and fit will be evaluated with the new HOA-optimized lens. A designated study team member will measure visual acuity and over-refraction of the patient. If an adjustment is needed for the lens, then a new device will be made, and the third visit evaluation will be rescheduled.
Once well-fitting baseline and HOA-optimized test lenses are established, both lenses will be remade and presented to the evaluator designated study team member in charge of evaluation and subject together in a masked fashion. During a fourth visit, the patient's vision will be extensively evaluated using standard non-invasive optometric measurements with each of the two lenses. First the patient will undergo a basic evaluation with each lens to ensure that the fit is correct. The patient will then undergo basic visual acuity; high and low contrast visual acuity, contrast sensitivity, and subjective vision scoring with each lens. The subject's wavefront aberration will also be measured again with each lens.
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Locations
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New York
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Rochester, New York, United States, 14642
- Flaum Eye Institute, University of Rochester Medical Center
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
A person will be included in the study if he/she:
- Is 18 years or older and has full legal capacity to volunteer.
- Has been diagnosed with Keratoconus;
- Has no other active ocular disease;
- Is currently wearing the BostonSight BSS in at least one eye ;
- Has non-spherical BostonSight BSS haptic design in the study eye;
- Has 20/400 or better best corrected visual acuity with pinhole 20/60 or better in the study eye;
- Is not pregnant or nursing;
- Has voluntarily agreed to participate in the study by signing the statement of informed consent;
A person will be excluded from the study if he/she:
- Is under the age of 18;
- Has best corrected visual acuity outside 20/400;
- Pregnant or nursing at the time of enrollment in the study;
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Basic Science
- Allocation: N/A
- Interventional Model: Single Group Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Customized Scleral Lens
A customized scleral lens will be compared with a non-customized scleral lens in subjects with Keratoconus through vision tests.
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A wavefront customized scleral lens will be made for each subject and tested against a non-customized lens.
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Number of Participants With Normal Vision
Time Frame: 30 minutes
|
Vision will be tested using the Basic Snellen Visual Acuity test and normal vision will be defined as 20/20.
|
30 minutes
|
Collaborators and Investigators
Sponsor
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
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
- 72749
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
product manufactured in and exported from the U.S.
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
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Eye Hospital Pristina KosovoActive, not recruitingKeratoconus | Keratoconus of Right Eye | Keratoconus, Unstable, Right EyeKosovo
-
Tianjin Eye HospitalRecruitingScansys, Pentacam, Keratoconus, Subclinical KeratoconusChina
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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
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Centre Hospitalier Régional Metz-ThionvilleCompletedProgressive Keratoconus
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Glaukos CorporationCompletedProgressive KeratoconusUnited States
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Tianjin Eye HospitalCompletedKeratoconus, StableChina
Clinical Trials on Customized Scleral Lens
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Coopervision, Inc.Not yet recruiting
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University of HoustonCompleted
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University of HoustonCompletedOcular HypertensionUnited States
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Mayo ClinicRecruitingOcular HypertensionUnited States
-
Jennifer FogtCompleted
-
Seoul National University HospitalCompletedOcular Surface Disease
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University of California, Los AngelesNational Eye Institute (NEI); California Institute for Regenerative Medicine...Recruiting
-
University of WaterlooPrecision Technology Services LtdCompleted
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St. Erik Eye HospitalUmeå UniversityActive, not recruiting