Comparison Between Bare Scleral Technique and Conjunctival Auto-graft on Corneal Topography After Pterygium Surgery
Study Details
Study Description
Brief Summary
Aim of the work:
To study the corneal topographic pattern changes in patients who have pterygium excision by two surgical techniques (bare sclera, conjunctival autograft).
| Condition or Disease | Intervention/Treatment | Phase |
|---|---|---|
|
Detailed Description
Pterygium is one of the common ocular surface disorders , it's is an elastotic triangular fibro-vascular tissue covered by conjunctival epithelium that spreads over the cornea. Pterygium causes differences in curvature & power across the cornea .
The prevalence of pterygium varies from 1.1% to 53% globally in different environmental conditions. Risk factors include;UV radiation, geographical latitude near to the equator, outdoor activity , aging, male, and dusty environment.
Pterygium excision is important in patients suffering from blurred vision due to astigmatism . Surgical techniques include ; bare sclera excision, conjunctival autograft, conjunctival transpositional flap, and amniotic membrane grafting. Pterygium excision increases in the mean central corneal curvature & reduces astigmatism that leads to improvement in visual acuity.
Corneal topography is a gold standard in corneal pathology follow-up. Corneal topography is a computer assisted diagnostic tool that creates a three-dimensional map of the surface curvature of the cornea. Corneal topography produces a detailed, visual description of the shape and power of the cornea.
In this study , corneal topography is used to detect how does corneal curvature change after excision of pterygium .
Study Design
Arms and Interventions
| Arm | Intervention/Treatment |
|---|---|
| pterygium surgery with bare scleral technique corneal topograghy before and after surgery |
Device: corneal topography
corneal topography before and after pterygium surgery by two techniques bare scleral and conjunctival autograft
|
| pterygium surgery with conjunctival autograft technique corneal topograghy before and after surgery |
Device: corneal topography
corneal topography before and after pterygium surgery by two techniques bare scleral and conjunctival autograft
|
Outcome Measures
Primary Outcome Measures
- comparison of topography finding after pterygium surgery by the bare scleral technique. [baseline]
To investigate the corneal topographic changes by imaging the corneal topography before and after pterygium excision (by the bare scleral technique); to detect corneal curvature changes.
- comparison of topography finding after pterygium surgery by the conjunctival auto-graft technique. [baseline]
To investigate the corneal topographic changes by imaging the corneal topography before and after pterygium excision (by the conjunctival auto-graft technique); to detect corneal curvature changes.
Eligibility Criteria
Criteria
Inclusion Criteria:-
-
Patients with pterygium not associated with other pathologies (suitable for excision).
-
Nasal pterygium extended to the cornea.
Exclusion Criteria: -
-
Associated pathologies such as glaucoma, and cataract.
-
Corneal opacities or irregularities, scars, dystrophy or ectasia.
-
Patients who underwent previous corneal surgery (including refractive surgery)
-
Pseudo-pterygium.
Contacts and Locations
Locations
No locations specified.Sponsors and Collaborators
- Sohag University
Investigators
None specified.Study Documents (Full-Text)
None provided.More Information
Publications
- Soh-Med-22-10-02