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Selective Equatorial Sclera Crosslinking in the Orbit Using a Metal-Coated Polymer Waveguide.

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Advanced flexible waveguides deliver targeted light for scleral crosslinking, a promising technique to stiffen eye tissue and potentially treat pathologic myopia.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Materials Science

Background:

  • Pathologic myopia involves excessive eye elongation.
  • Scleral stiffening via photochemical crosslinking is a potential treatment.
  • Uniform light delivery to the sclera is a significant challenge.

Purpose of the Study:

  • To demonstrate advanced flexible polymer waveguides for targeted light delivery to the equatorial sclera.
  • To overcome limitations in light delivery for scleral crosslinking in the intact orbit.

Main Methods:

  • Developed polydimethylsiloxane-clad, polyurethane-core waveguides with reflective silver coating.
  • Tested in situ equatorial sclera crosslinking in postmortem rabbit eyes.
  • Performed ex vivo tensometry to measure biomechanical stiffening.

Main Results:

  • Achieved efficient light delivery to the equatorial sclera with minimal periorbital leakage.
  • Demonstrated a 22% coefficient of variation in light intensity in the intact orbit.
  • Observed a 92% increase in Young's modulus (P < 0.05) in ex vivo crosslinked eyes.

Conclusions:

  • Flexible, reflective waveguides facilitate targeted scleral crosslinking.
  • The demonstrated procedure shows potential for in vivo application in animal models and humans.
  • This technique may offer a novel approach to managing pathologic myopia.