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Computational modeling of corneal and scleral collagen photocrosslinking
Brandon G Gerberich1, Amy J Wood-Yang2, Afsane Radmand2
1Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia.
Abstract:
Scleral photocrosslinking is increasingly investigated for treatment of myopia and glaucoma. In this study a computational model was developed to predict crosslinking efficiency of visible/near infrared photosensitizers in the sclera. Photocrosslinking was validated against riboflavin corneal crosslinking experimental studies and subsequently modeled for the sensitizer, methylene blue, administered by retrobulbar injection to the posterior sclera and irradiated with a transpupillary light beam. Optimal ranges were determined for treatment parameters including light intensity, methylene blue concentration, injection volume, and inspired oxygen concentration. Additionally, sensitivity of crosslinking to various parameters was quantified. The most sensitive parameters were oxygen concentration in the injection solution, scleral thickness, and injection reservoir thickness (i.e., injection volume).
Insights
This study developed a computational model to optimize scleral photocrosslinking for myopia and glaucoma treatment. The model identified key parameters like oxygen concentration and injection volume that most influence crosslinking efficiency.
Area of Science:
- Ophthalmology
- Biomedical Engineering
- Photochemistry
Background:
- Scleral photocrosslinking shows promise for treating myopia and glaucoma.
- Optimizing crosslinking efficiency is crucial for therapeutic success.
Purpose of the Study:
- To develop a computational model predicting scleral photocrosslinking efficiency.
- To identify optimal treatment parameters for methylene blue-mediated scleral photocrosslinking.
Main Methods:
- A computational model was developed and validated against riboflavin corneal crosslinking data.
- Methylene blue was modeled as the photosensitizer delivered via retrobulbar injection.
- Transpupillary light irradiation was simulated to assess crosslinking.
Main Results:
- Optimal ranges for light intensity, methylene blue concentration, injection volume, and oxygen concentration were determined.
- Oxygen concentration, scleral thickness, and injection volume were identified as the most sensitive parameters.
Conclusions:
- The computational model provides a framework for optimizing scleral photocrosslinking parameters.
- Understanding parameter sensitivity is key to enhancing therapeutic outcomes for myopia and glaucoma.
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