Extracorporeal Optimization of Corneal Allogenic Intrastromal Ring Segments
CAIRS solved the material problem, not the handling problem — soft stroma, a mm-wide tunnel, a segment that has to be placed exactly right [4,6,7].
ECO-CAIRS cross-links it outside the eye. No endothelium in the beam, no fluence ceiling — 30 J/cm² [4,8].
At 5% strain, both 30 J/cm² stiffen the segment significantly more than conventional CXL at 10 J/cm² — and not differently from each other. Either will do [8].
Elastic modulus at 5% strain — N/mm, mean ± SD, 84 porcine corneas
Cross-linked segments dry down further than air-dried controls, then come back far slower. The working window stays open [9].
Median thickness change — µm, 96 porcine ring segments
A cornea holds still. A ring segment does not — small, curved, and it must keep position and orientation under the beam throughout. The Cradle does that; its degree markings set arc length and orientation. Preparation moves into the OR.
Cross-Link up to 4 segments simultaneously, and screw the sterile metal cap onto the marking area to preserve sterility.
Either manually or using the Femtosecond laser [3, 7].
One riboflavin loading carries about 30 J/cm² [4,9]. Position by the degree markings; irradiate across 10 mm for even treatment [4].
365 nm · 30 mW/cm² · Continuous light · 10 mm diameter
No air-drying needed [4].
The technique Was published in the renowned
“Journal of Refractive Surgery” in 2025 – https://pubmed.ncbi.nlm.nih.gov/41212961/
Was published in the leading journal Journal
of Cataract and Refractive Surgery”:
https://pubmed.ncbi.nlm.nih.gov/42187317/
Also published in the Journal of Cataract and Refractive Surgery”:
https://pubmed.ncbi.nlm.nih.gov/423779
Take the cross-linking out of the eye and the fluence ceiling goes with it. What enters the tunnel is stiffer, thinner, slower to swell, and acellular [4,8,9,14]. C-eye and Cradle put that in the OR — with three published papers behind it, not a proposal [4,8,9].
