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Comparison of Corneal Stromal Tissue Consumption (LATAC)

NCT02519673 · Status: COMPLETED · Type: OBSERVATIONAL · Enrollment: 50

Last updated 2017-03-20

No results posted yet for this study

Summary

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.

Conditions

  • Disorders, Refractive

Interventions

DEVICE

Measurement of stromal tissue ablation

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.

Sponsors & Collaborators

  • Fondation Ophtalmologique Adolphe de Rothschild

    lead NETWORK

Eligibility

Min Age
18 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2015-08-08
Primary Completion
2017-01-18
Completion
2017-03-15

Countries

  • France

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT02519673 on ClinicalTrials.gov