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Related Experiment Videos

Sclerostomy ab interno using long-wave laser modalities: acute morphological effects

E van der Zypen1, C England, F Fankhauser

  • 1Institute of Anatomy, University of Bern, Switzerland.

German Journal of Ophthalmology
|January 1, 1995
PubMed
Summary

This study compared thermal damage from three laser types used for creating sclerostomy fistulas in porcine eyes. All lasers caused similar levels of collateral thermal damage, indicating no significant difference in their impact.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Laser Physics

Background:

  • Glaucoma surgery often involves creating fistulas to reduce intraocular pressure.
  • Minimizing thermal damage during surgical procedures is crucial for patient outcomes.
  • Laser technology offers precise methods for tissue ablation.

Purpose of the Study:

  • To compare the collateral thermal damage induced by different laser modalities during ab interno sclerostomy fistula creation.
  • To evaluate the effectiveness of Ho:YAG, Nd:YAG, and diode lasers in minimizing thermal insult.

Main Methods:

  • Sclerostomy fistulas were created ab interno in cadaver porcine eyes using a 200-micron silica optical fiber.
  • Three laser types were employed: Holmium:YAG (Ho:YAG), Neodymium:YAG (Nd:YAG), and diode laser.

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  • Thermal damage was assessed qualitatively using light and electron microscopy.

    • Main Results:

    • Significant local variation in coagulated tissue breadth was observed, regardless of the laser source used.
    • No intrinsic difference in the intensity or extent of thermal damage was found between Ho:YAG, Nd:YAG, and diode lasers.
    • The active contact method with optical fiber delivery did not inherently favor one laser modality over others regarding thermal insult.

    Conclusions:

    • The choice of Ho:YAG, Nd:YAG, or diode laser does not significantly impact collateral thermal damage when creating sclerostomy fistulas using this method.
    • Further research may explore alternative surgical techniques or laser parameters to further minimize thermal effects in glaucoma surgery.