An observational study in Disorders, Refractive, sponsored by Fondation Ophtalmologique Adolphe de Rothschild. Completed at 1 site in France. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2017-03-20.
Sponsored by Fondation Ophtalmologique Adolphe de Rothschild · Observational
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.
413 studies on the registry are indexed under Refractive Errors; 62 are open to participants now.
This study's enrollment of 50 is below the median of 150 across 107 observational studies indexed under Refractive Errors.
Browse Refractive Errors studies →Fondation Ophtalmologique Adolphe de Rothschild is the lead sponsor of 311 studies on the registry; 77 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Patients having a refractive disorder and for whom a refractive surgery by LASIK is programmed.
Exclusion Criteria:
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.
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
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.
Time frame: One month
This study is completed, as verified in Mar 2017. You cannot join it, but the record below documents what was studied.
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Fondation Ophtalmologique Adolphe de Rothschild