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Updated: Jun 20, 2026

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Experimental evaluation of optimized ablation patterns for laser refractive surgery.

Carlos Dorronsoro1, Laura Remon, Jesús Merayo-Lloves

  • 1Instituto de Optica Daza de Valdés, Consejo Superior de Investigaciones Científicas, Serrano 121, 28006, Madrid, Spain. cdorronsoro@io.cfmac.csic.es

Optics Express
|August 19, 2009
PubMed
Summary

Plastic artificial eyes reveal significant differences in excimer laser ablation profiles for refractive surgery. These findings highlight the need for efficiency correction factors to optimize post-operative corneal shapes and reduce aberrations.

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Area of Science:

  • Ophthalmology and Vision Science
  • Biomedical Engineering
  • Laser Physics

Background:

  • Refractive surgery utilizes excimer lasers to correct vision by ablating corneal tissue.
  • Optimizing laser algorithms is crucial for predictable outcomes and minimizing side effects like spherical aberration.
  • Understanding laser-device interactions and efficiency variations is key to improving surgical precision.

Purpose of the Study:

  • To evaluate and compare the ablation profiles of three advanced excimer lasers using a novel artificial eye model.
  • To quantify laser efficiency losses across different ablation depths and surface geometries.
  • To assess the impact of laser parameters and efficiency variations on predicted post-operative corneal shapes and aberrations.

Main Methods:

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Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile
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Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile

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Last Updated: Jun 20, 2026

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter
05:14

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter

Published on: September 16, 2025

Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile
05:46

Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile

Published on: September 20, 2024

  • Utilized Filofocon A (plastic) artificial eyes as an experimental model for refractive surgery simulations.
  • Measured 3-D ablation patterns from myopic corrections (-3 D to -9 D) on flat and spherical plastic surfaces using optical profilometry.
  • Analyzed ablation depth, shape, laser efficiency losses, and predicted post-operative corneal parameters (asphericity, spherical aberration).

    • Main Results:

    • Significant differences were observed in ablation pattern shape and depth among the three tested excimer lasers.
    • Laser efficiency losses from the center to the periphery of spherical surfaces varied significantly across lasers and depended on fluence.
    • Predicted post-operative corneal shapes, ablated volumes, asphericity, and spherical aberrations differed notably between lasers.

    Conclusions:

    • Experimental plastic models provide a valuable platform for assessing excimer laser outcomes and calibrating devices.
    • Current laser algorithms, while optimized, can be further improved by incorporating efficiency correction factors derived from such models.
    • Systematic use of plastic models can help calculate experimental correction factors to minimize induced asphericity and aberrations in refractive surgery.