- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT00413673
Initial Evaluation of Photorefractive Keratectomy in U.S. Army Personnel
March 31, 2008 updated by: Walter Reed Army Medical Center
The objective of this study is to conduct a prospective clinical trial to evaluate the safety and efficacy fo the VISX Excimer Laser system for the treatment of naturally occurring low to moderate myopia, with or without low levels of astigmatism, in U.S. Army personnel.
Study Overview
Study Type
Interventional
Enrollment (Anticipated)
100
Phase
- Not Applicable
Contacts and Locations
This section provides the contact details for those conducting the study, and information on where this study is being conducted.
Study Locations
-
-
District of Columbia
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Washington, District of Columbia, United States, 20307
- Walter Reed Army Medical Center, Center For Refractive Surgery
-
-
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
21 years and older (Adult, Older Adult)
Accepts Healthy Volunteers
Yes
Genders Eligible for Study
All
Description
Inclusion Criteria:
- Informed consent.
- Normal, healthy active adults with access to medical care at Walter Reed Health Care System.
- Age 21 years or older.
- Spherical equivalent of the manifest refractive error between -1.0 to -6.0 diopters (D), inclusive, with no more than 3.0D of cylinder. The absolute value of the cylinder (expressed in minus cylinder) will be limited such that the short axis of the elliptical ablation will be no smaller than 4.9mm. The following specifies the maximum cylinder for a given spherical component of the manifest refraction:
Spherical component / Maximum cylinder
- 1.0D / -0.5D
- 2.0D / -1.0D
- 3.0D / -1.5D
- 4.0D / -2.0D
- 5.0D / -2.5D
- 6.0D / -3.0D
- Corrected vision of at least 20/20
- Soft contact lens users must havE removed their lenses at least two weeks prior to baseline measurements.
- Hard contact lens users (PMMA or rigid gas permeable lenses) must have removed their lenses at least four weeks prior to baseline measurements. At least two weekly manifest refractions and keratometry measurements will be required in this interval. The last two measurements must not vary by more than 0.50D in any meridian.
- Patients undergoing orthokeratology must have their lenses removed at least 6 months prior to the baseline examination. At least two monthly manifest refractions and keratometry measurements taken after the third month out of lenses must not vary by more than 0.50D in any meridian.
- Refractive stability must be documented by previous refractions. Spherical and cylindrical portion of the manifest refraction must not have varied by more than 0.50D over the previous 12 months.
- Exhibits strong motivation for keeping the follow-up visits.
- Available for evaluation at Walter Reed during the two-year follow-up period.
- Service members must have their command approval to participate in the study.
- Access to transportation to meet follow-up requirements.
Exclusion Criteria:
- Residual, recurrent or active ocular diseases or corneal abnormalities in either eye such as iritis, uveitis, keratoconjunctivitis sicca, herpetic keratitis, vernal conjunctivitis, lagophthalmos, corneal scarring, glaucoma, previous steroid responder, occludable chamber angles, visually significant cataracts.
- Either one or both eyes suffering from chronic dryness.
- Taking any systemic medications that may affect wound healing such as corticosteroids or antimetabolites.
- Patient corneal neovascularization within one mm of the ablation zone.
- History of any previous eye surgery, including previous refractive surgery.
- Best corrected visual acuity of less than 20/20.
- Progressive myopia or keratoconus.
- Any systemic disease that may affect wound healing, such as connective tissue disorders (rheumatoid arthritis, systemic lupus erythematosus, etc.), diabetes, or severe atopic disease.
- Any physical or mental impairment that would preclude participation in any of the examinations.
- For contact lens users there must be no evidence of contact lens corneal warpage on computerized topography.
- Currently on flight status or projected to be on flight status within ten years.
- Pregnant or breast-feeding an infant. Women of childbearing age must take a urine blood pregnancy test before starting 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: Non-Randomized
- Interventional Model: Single Group Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: 1
PRK
|
PRK
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Time Frame |
---|---|
safety and efficacy of PRK
Time Frame: 12 months after surgery
|
12 months after surgery
|
Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Sponsor
Investigators
- Principal Investigator: KRAIG S. BOWER, MD, Walter Reed Army Medical Center
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
August 1, 2001
Study Completion
March 1, 2008
Study Registration Dates
First Submitted
December 19, 2006
First Submitted That Met QC Criteria
December 19, 2006
First Posted (Estimate)
December 20, 2006
Study Record Updates
Last Update Posted (Estimate)
April 1, 2008
Last Update Submitted That Met QC Criteria
March 31, 2008
Last Verified
November 1, 2007
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- WRAMC WU # 2335-99
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.
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