Disorders, Refractive Clinical Trial
Official title:
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.
n/a
| Status | Clinical Trial | Phase | |
|---|---|---|---|
| Completed |
NCT02522416 -
A Comparison of Two Devices for Measuring the Central Thickness of the Cornea Before and After Surgery (CECOT)
|
N/A |