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Customized Corneal Cross-Linking-A Mathematical Model.

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  • 1*Corneal Transplant Center, Pellegrini Hospital, Naples, Italy; †Mercy Center for Corrective Eye Surgery, McHenry, IL; ‡Department of Pharmacy, University of Naples Federico II, Naples, Italy; §Department of Ophthalmology, Pellegrini Hospital, Naples, Italy; ¶Department of Ophthalmology, Salerno University Hospital, Salerno, Italy; and ‖Institute of Refractive and Ophthalmic Surgery (IROS), Naples, Italy.

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Summary
This summary is machine-generated.

This study introduces a new method for corneal cross-linking, customizing ultraviolet A (UV-A) exposure based on corneal thickness to enhance safety and effectiveness. The findings allow for shorter treatment times and reduced UV-A fluence compared to existing protocols.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Corneal Science

Background:

  • Corneal cross-linking (CXL) is a procedure to strengthen the cornea.
  • Current CXL protocols may lack individualized safety and efficacy parameters.
  • Optimizing UV-A exposure based on corneal thickness is crucial for patient outcomes.

Purpose of the Study:

  • To develop a customized ultraviolet A (UV-A) exposure protocol for corneal cross-linking.
  • To improve the safety, reproducibility, and depth of effect of CXL.
  • To tailor UV-A exposure time and fluence according to individual corneal thickness.

Main Methods:

  • Human corneas were treated with a transepithelial (EPI-ON) riboflavin soak.
  • A new equation was derived based on UV-A parameters and riboflavin oxidation to predict endothelial protection.
  • Graphs were created to prescribe maximum safe UV-A fluence and exposure time based on corneal pachymetry.

Main Results:

  • Analysis yielded graphs correlating maximum safe UV-A fluence with exposure time and corneal thickness.
  • Prescribed UV-A fluence ranged from 1.8 mW/cm² for 540 μm corneas to 1.2 mW/cm² for 350 μm corneas.
  • Irradiation times were generally under 15 minutes.

Conclusions:

  • The study provides a basis for graphs that prescribe safe UV-A fluence and exposure time for varying corneal thicknesses.
  • This protocol, with a clear corneal surface during irradiation, allows for reduced UV-A exposure time and fluence compared to the Dresden protocol.
  • The findings enhance the safety and efficiency of corneal cross-linking procedures.