Corneal Topography
Conditions
Keywords
pterygium surgery by bare scleral & autograft
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).
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 .
Interventions
DEVICEcorneal topography
corneal topography before and after pterygium surgery by two techniques bare scleral and conjunctival autograft
Sponsors
Sohag University
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Healthy volunteers
No
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.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| 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. |
Contacts
Primary ContactZeinab Mahmoud Aly, bechlor
Backup ContactAlahmady Hamad Elsamman, MD
Outcome results
None listed