Comparison of Corneal Stromal Tissue Consumption (LATAC) (LATAC)
Comparison of Corneal Stromal Tissue Consumption Values Estimated When Programming the Intervention Versus the Values Measured by Pre and Postoperative Topography
In refractive surgery, stromal ablation depth is fundamental because it determines the thickness of the residual posterior wall. The posterior wall is an essential element that guarantees the refractive stability and the long term prevention of corneal ectasia after corneal refractive surgery. A minimum thickness of more or less 300 microns is universally accepted. Its calculation is based on well-known formulas, such as Munnerlynn ones.
With the excimer laser platform last generation WaveLight® Allegretto® EX-500 of Alcon, a new treatment option called "wavefront optimized" is offered for myopia, astigmatism and hyperopia. The ablation profile has been developed to save stromal tissue consumption and to favor the quality of vision, by optimizing connections between the optical zone and the transition zone of the photoablation. Alongside the theoretical formulas, evaluation of the depth of ablation may be defined by differential ultrasonic pachymetry or by topographical analysis pre and postoperatively. The latter is currently the method of reference to assess the corneal thickness.
研究概览
研究类型
注册 (实际的)
联系人和位置
学习地点
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Paris、法国、75019
- Fondation ophtalmique Adolphe de Rothschild
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参与标准
资格标准
适合学习的年龄
接受健康志愿者
有资格学习的性别
取样方法
研究人群
描述
Inclusion Criteria:
- Patients having a refractive disorder and for whom a refractive surgery is programmed.
Exclusion Criteria:
- Patient opposed to participation in the study
- Another refractive surgery technique
- Hyperopic patient
- Pregnant or lactating woman
- Patient under a measure of legal protection
- Absence of affiliation to social security or universal health coverage (CMU)
学习计划
研究是如何设计的?
设计细节
研究衡量的是什么?
主要结果指标
结果测量 |
措施说明 |
大体时间 |
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Difference between stromal tissue consumption, expressed in micrometers, estimated before surgery by WaveLight Allegretto EX-500 laser and measured one month after surgery by Pentacam
大体时间:One month
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Stromal tissue consumption will be estimated preoperatively by WaveLight Allegretto EX-500 laser and central corneal thickness will be measured by Pentacam.
One month after refractive surgery, during follow-up,central corneal thickness will be again measured by Pentacam.
The difference between the estimated and the measured tissue consumption will be calculated.
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One month
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合作者和调查者
研究记录日期
研究主要日期
学习开始 (实际的)
初级完成 (实际的)
研究完成 (实际的)
研究注册日期
首次提交
首先提交符合 QC 标准的
首次发布 (估计)
研究记录更新
最后更新发布 (实际的)
上次提交的符合 QC 标准的更新
最后验证
更多信息
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