- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT03140046
Visual Outcomes of Topography Guided Photorefractive Keratectomy (PRK) for Treatment of Patients With Irregular Cornea
Irregular astigmatism is one of the most serious and frequent complications of corneal refractive surgery and one of the worst sequelae of other forms of corneal surgery . It is also considered as one of common, serious complications of corneal injuries .
Spectacle correction is usually not useful in the correction of corneal irregular astigmatism. Contact lenses represent a good alternative, but their adaptation and stability are limited by the irregular corneal surface and patient discomfort.
In recent years, advancements in laser technology have offered better tools for dealing with irregular astigmatism with finding new surgical methods to improve corneal regularity for the correction of irregular astigmatism.
Topography-linked excimer laser is a potentially effective technique in the treatment of irregular astigmatism after keratoplasty . In fact, customized ablation was shown to be an effective means of treatment of irregular astigmatism due to different etiologies Such as corneal Injuries , scar , or postoperative.
Some of the theoretical advantages of topography-driven photorefractive keratectomy (PRK) are a better astigmatic correction, the possibility of correcting irregular astigmatism, and a smaller ablation volume compared with standard treatments, resulting in better visual performance.
Aim of the work To evaluate the efficacy, safety, and predictability of topography-guided photorefractive keratectomy (PRK) to improve refractive status of patient with irregular Cornea.
Study Overview
Status
Conditions
Intervention / Treatment
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Locations
-
-
-
Assiut, Egypt
- Assiut University
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
- Child
- Adult
- Older Adult
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
Patients with irregular corneal astigmatism caused by:
- Trauma.
- Non - Central Corneal Scars.
- Previous corneal surgery.
- With No other abnormalities in the eye.
- Patient is willing to enter the study and sign a consent.
Exclusion Criteria:
- Patients with central corneal scars.
- Patients with central haze interfering with visual acuity.
- Patients with ectasia at corneal graft margins.
- Patients with irregular astigmatism caused by corneal ectasia or keratoconus.
- Patients had refractive surgery with ablations leaving a residual corneal thickness less than 250 μm.
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: N/A
- Interventional Model: Single Group Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Corneal Topography
we will do Corneal Topography for every patient before doing photorefractive keratectomy (PRK) and also after it , to measure the change in the quality of vision and measure the change in the quality of vision
|
The cornea will be ablated while the patient fixating on target light under constant eye-tracking control.
The ablations will be made using the "ALLEGRETTO X 500WAVE excimer laser" (WaveLight Laser Technologie AG).
Other Names:
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Visual Acuity
Time Frame: follow up after 1 day, 1 week, 1 month and 3 months
|
The measure of the Visual Acuity and Best Corrected Visual acuity Using the Snellen Chart which give use an idea about visual acuity in Metric scale (e.g.
6\6 , 6\12)
|
follow up after 1 day, 1 week, 1 month and 3 months
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Refractive State
Time Frame: follow up after 1 day, 1 week, 1 month and 3 months
|
We will measure the Refractive state of the eye by using the Auto refractor which give us an idea about the refractive state in a Diopteric scale ( e.g.
-2D , +4 D) .
|
follow up after 1 day, 1 week, 1 month and 3 months
|
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
Additional Relevant MeSH Terms
Other Study ID Numbers
- PRK
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
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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