Comparison of Optical biometry and Conventional acoustic biometry in the axial length measurement in silicone oil filled eyes.
试验速览
- 阶段
- 不适用
- 状态
- 尚未招募
- 发起方
- 入组人数
- 50
- 试验地点
- 1
- 主要终点
- Mean Difference in axial length measurement.
研究概览
简要总结
The study is aiming to compare the mean difference in axial length obtained by A scan biometry and Optical biometry in silicone oil filled eyes with a settled retina. In patients with a mild to moderate cataract the post operative refractive error will be estimated at one month post operative period.
In Silicone Oil filled eyes there is an increase of axial length when measured using A-scan biometry. This is because the velocity of sound in silicone oil filled eyes is slower than in the vitreous humour. Therefore we need to apply a correction factor to adjust for the same.
Axial length measurement using optical biometry in silicone oil filled eyes uses optical low coherence reflectometry principle and measures axial length along the visual axis of the eye.
There is a controversy whether the conventional methods of accoustic biometry are as reliable as the Newer Optical Biomatry based methods in axial length evaluation in silicone oil filled eyes which this study is aiming to provide a better understanding of.
研究设计
- 研究类型
- Observational
入排标准
- 年龄范围
- 18.00 Year(s) 至 90.00 Year(s)（—）
- 性别
- All
入选标准
- •Silicone oil filled eye (1000Cs) with settled retina.
排除标准
- •Recurrent retinal detachment.
- •Corneal scarring.
- •Dense cataract.
- •Non fixating patients.
- •Other retinal pathologies.
- •Hyperoleon.
结局指标
主要结局
Mean Difference in axial length measurement.
时间窗: 1. Preoperative axial length | 2. One month post operative axial length
次要结局
- Post operative refractive error in the subgroup requiring cataract surgery with Intra occular lens implantation.(One month post operatively)