Corneal allogenic intrastromal ring segments have been described for the treatment of keratoconus.
They consist of implantable pieces of donor corneal stroma that, similar to Intacs (Addition Technology), reshape the recipient cornea, but with a theoretically lessened risk for certain postoperative complications including extrusion and melt. Before implantation, corneal allogenic intrastromal ring segments (CAIRS) are debrided of their epithelium and endothelium and then dried, which transiently shrinks and stiffens them, facilitating insertion. Debriding and drying the segments may be
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