A Comparative Study Between Bare Scleral Technique and Conjunctival Autograft on Corneal Topography After Pterygium Surgery
试验速览
- 阶段
- 不适用
- 状态
- 尚未招募
- 入组人数
- 30
- 主要终点
- comparison of topography finding after pterygium surgery by the bare scleral technique.
研究概览
简要总结
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).
详细描述
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 .
研究设计
- 研究类型
- Observational
- 观察模型
- Cohort
- 时间视角
- Prospective
入排标准
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Patients with pterygium not associated with other pathologies (suitable for excision).
- •Nasal pterygium extended to the cornea.
排除标准
- •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.
结局指标
主要结局
comparison of topography finding after pterygium surgery by the bare scleral technique.
时间窗: 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.
时间窗: 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.
次要结局
未报告次要终点
研究者
Zainab Mahmoud Ali
resident
Sohag University