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Ablation smoothness as a function of excimer laser delivery system

C B O'Donnell, J Kemner, F E O'Donnell

    Journal of Cataract and Refractive Surgery
    |July 1, 1996
    PubMed
    Summary

    Galvanometric scanning excimer laser systems create significantly smoother ablation profiles compared to iris diaphragm systems. This technology offers superior surface smoothness for ophthalmic procedures.

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    Area of Science:

    • Ophthalmology
    • Laser Technology
    • Surface Metrology

    Background:

    • Excimer laser refractive surgery aims for precise tissue ablation.
    • Different laser delivery systems exist, impacting ablation profile quality.
    • Surface smoothness is critical for optimal visual outcomes.

    Purpose of the Study:

    • To quantitatively compare the ablation profiles of three excimer laser delivery systems.
    • To determine which system yields the smoothest ablation surface.
    • To inform selection of laser technology for refractive surgery.

    Main Methods:

    • Excimer laser myopic ablations were performed on PMMA test blanks.
    • Three delivery systems were tested: iris diaphragm (no homogenizer), iris diaphragm (with homogenizer), and galvanometric scanning.
    • Surface smoothness was measured using a scanning white-light interferometer (RMS, peak-to-valley, arithmetic average).

    Main Results:

    • Galvanometric scanning systems produced smoother ablations (approx. 3x smoother by RMS) than iris diaphragm with homogenizer (P=.01).
    • Iris diaphragm with homogenizer systems were approx. 2x smoother than iris diaphragm without homogenizer (P=.03).
    • Galvanometric scanning demonstrated superior surface smoothness.

    Conclusions:

    • Galvanometric scanning delivery systems offer significantly smoother ablation profiles.
    • This smoother profile is advantageous for ophthalmic laser procedures.
    • The findings support galvanometric scanning as a preferred technology for precise excimer laser ablation.

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