Corneal allogenic intrastromal ring segments have been described by Jacob and colleagues for the treatment of keratoconus.
They consist of semicircular pieces of donor corneal stroma that may be surgically implanted to flatten, stiffen and stabilize the shape of the recipient cornea.
Early corneal allogenic intrastromal ring segments (CAIRS) protocols used donor segments prepared immediately before implantation, at the time of the surgery. However, because this process involves multiple steps, it may add significantly to the overall procedure time. In addition, any problems encountered during