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Related Experiment Video

Updated: Jun 3, 2026

Three Different Protocols of Corneal Collagen Crosslinking in Keratoconus: Conventional, Accelerated and Iontophoresis
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Three Different Protocols of Corneal Collagen Crosslinking in Keratoconus: Conventional, Accelerated and Iontophoresis

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Corneal cross-linking and safety issues.

Eberhard Spoerl1, Anne Hoyer, Lutz E Pillunat

  • 1Department of Ophthalmology, Carl Gustav Carus University Hospital, Dresden, Germany.

The Open Ophthalmology Journal
|March 15, 2011
PubMed
Summary

Corneal collagen cross-linking (CXL) using riboflavin/UVA is safe for the cornea, lens, and retina when the corneal stroma is at least 400 microns thick. This ensures irradiance remains below damaging thresholds for ocular structures.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Photochemistry

Background:

  • Corneal collagen cross-linking (CXL) is a therapeutic procedure.
  • The riboflavin/UVA (370 nm) approach is a common method for CXL.
  • Assessing the safety of CXL is crucial for patient outcomes.

Purpose of the Study:

  • To evaluate the safety profile of the riboflavin/UVA approach for corneal collagen cross-linking.
  • To analyze the potential risks to ocular structures during CXL procedures.

Main Methods:

  • Analysis of the current corneal collagen cross-linking treatment protocol.
  • Evaluation of safety parameters related to riboflavin/UVA application.
  • Comparison of applied UVA dose and irradiance with established damage thresholds.
Keywords:
Keratoconusbiomechanicscorneacross-linking.ultraviolet light

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Main Results:

  • Current UVA dose density (5.4 J/cm²) and irradiance (3 mW/cm²) are below UVA damage thresholds for the cornea, lens, and retina.
  • Photochemical damage threshold for endothelial cells is 0.35 mW/cm².
  • Irradiance at the endothelium level (0.18 mW/cm²) is half the damage threshold in a 400μm riboflavin-saturated stroma.

Conclusions:

  • Corneal collagen cross-linking with riboflavin/UVA is safe for the corneal endothelium, lens, and retina if the corneal stroma thickness is at least 400 microns.
  • Homogenous irradiance from the light source is essential to prevent localized damage (hot spots).