Comparison Between Bare Scleral Technique and Conjunctival Auto-graft on Corneal Topography After Pterygium Surgery

Sohag University

Status: Not yet enrolling

Conditions: Corneal Topography

Treatments: Device: corneal topography

Study type: Observational

Funder types: Other

Identifiers

NCT05812508

Soh-Med-22-10-02

Details and patient eligibility

About

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).

Full 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 .

Enrollment: 30 estimated patients

Sex: All

Volunteers: No Healthy Volunteers

Inclusion and exclusion 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.

Trial design

30 participants in 2 patient groups

pterygium surgery with bare scleral technique

Description:

corneal topograghy before and after surgery

Treatment:

Device: corneal topography

pterygium surgery with conjunctival autograft technique

Description:

corneal topograghy before and after surgery

Treatment:

Device: corneal topography