Incisional Correction of Corneal Astigmatism During Phacoemulsification
试验速览
- 阶段
- 4 期
- 状态
- 已完成
- 发起方
- 入组人数
- 40
- 试验地点
- 2
- 主要终点
- Mean surgically induced astigmatism
研究概览
简要总结
Today, cataract surgery is regarded as refractive surgery, mainly aiming emmetropia, and this makes eliminating corneal astigmatism is critical. Corneal astigmatism of more than 1 diopter has been reported in up to 45% of the cataract surgery candidates.
It is possible to reduce pre-existing corneal astigmatism by creating a clear corneal incision at the steep meridian of the cornea, however; creating a small incision can correct the only astigmatism up to 1 Diopter, and sometimes this method may not be easy to perform due to the location of steep meridian like the difficulty while creating a superonasal or inferonasal incision at the left eye. This approach is usually sufficient for correcting astigmatism less than 1 D in most eyes. An opposite side clear corneal incision (OCCI) could enhance the flattening effect on the cornea.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Treatment
- 盲法
- None
入排标准
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Clear cornea
- •No history of previous ocular surgery
- •Central corneal thickness (CCT) <640
排除标准
- •Irregular corneal astigmatism or lenticular astigmatism
- •Corneal opacities or pathology like Fuch's endothelial dystrophy
- •Previous ocular surgeries like glaucoma surgery or PKP or pterygium excision
- •Posterior segment diseases and pathology
- •Complicated phacoemulsification
结局指标
主要结局
Mean surgically induced astigmatism
时间窗: After 1 month of surgery
Mean surgically induced astigmatism, measured by a vector-corrected method
Mean astigmatic correction
时间窗: After 1 month of surgery
Astigmatic correction change after the correction surgery
次要结局
- Change in visual acuity(After 1 month of surgery)