Effects of Riboflavin/UVA Cross-Linking on Corneal Structure
Author Information
Author(s): Hayes Sally, Boote Craig, Kamma-Lorger Christina S., Rajan Madhavan S., Harris Jonathan, Dooley Erin, Hawksworth Nicholas, Hiller Jennifer, Terill Nick J., Hafezi Farhad, Brahma Arun K., Quantock Andrew J., Meek Keith M.
Primary Institution: Cardiff University, Cardiff, United Kingdom
Hypothesis
To determine the effect of Ultraviolet-A collagen cross-linking with hypo-osmolar and iso-osmolar riboflavin solutions on stromal collagen ultrastructure in normal and keratoconus ex vivo human corneas.
Conclusion
The structural changes following Ultraviolet-A cross-linking with riboflavin solutions are primarily due to treatment-induced changes in tissue hydration rather than cross-linking.
Supporting Evidence
- Hypo-osmolar cross-linking increased corneal hydration in all corneas.
- Collagen interfibrillar spacing increased significantly in keratoconus and unswollen normal corneas after treatment.
- Fibril diameter increased in some unswollen normal corneas following hypo-osmolar treatment.
Takeaway
This study looked at how a special light treatment affects the structure of the eye's cornea, finding that changes in water content are more important than the actual cross-linking of collagen.
Methodology
Small-angle X-ray scattering was used to measure collagen structure in corneas before and after treatment with hypo-osmolar and iso-osmolar riboflavin solutions.
Limitations
The study was limited to ex vivo human corneas and may not fully represent in vivo conditions.
Participant Demographics
The study included normal donor corneas aged 61 to 87 years and keratoconus corneas from patients aged 24 and unknown.
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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