The Corneal Allogenic Intrastromal Ring Segments (CAIRS) technique represents a significant leap forward in the surgical management of keratoconus. Unlike traditional synthetic implants, CAIRS utilizes donor corneal tissue, processed into semi-circular segments, which is then inserted into mid-peripheral stromal channels created by a femtosecond laser. By using allogenic tissue, we achieve excellent biocompatibility and a reduced risk of long-term complications like melting or extrusion. The primary goal is to provide a “molding” effect that flattens the cone and regularizes the corneal curvature. This structural reinforcement significantly improves topometric indices and enhances best-corrected visual acuity for our patients. It is an elegant, tissue-based solution for stabilizing the ectatic cornea. In this video, our podcast guest from yesterday, Dr David Gunn, shows his technique and does the narration.
The keratoscopy improving is actually a reflex from the fluid on the corneal surface. If you look closely at the video, as the fluid dries out the keratoscopy shows an oval reflex again. The effect on my opinion takes a bit more time, especially in dehydrated segments. As the segment absorbs more water, it gains more volume and regularises the cornea more.