How Long Does CAIRS Last? Long-Term Results

If you’re a young person with keratoconus weighing up CAIRS, the question that really matters isn’t how the surgery works. It’s this: will it still be working in ten, twenty, thirty years? You’re going to live with this cornea for a long time. Here’s what more than a decade of worldwide experience says.

A short history, because it matters

CAIRS — corneal allogenic intrastromal ring segments — was first performed by Dr Soosan Jacob in India in 2015. Dr David Gunn and I brought the procedure to Australia, and Brisbane has since become one of the busiest CAIRS centres anywhere. That timeline matters for one simple reason: it means the world now has over eleven years of data on how these segments behave in real corneas, and the answer is that they behave very well.

Why donor tissue is the whole point

Ring segments themselves aren’t new. Synthetic plastic segments have been implanted into corneas for decades, and they work, but plastic in a thin keratoconic cornea has a known weakness: the cornea can slowly thin over the implant, and segments can erode or extrude over the years. I’ve written about this comparison in more detail in CAIRS vs CTAK.

CAIRS takes a different path. The segments are made from donor corneal tissue, the same material as your own cornea. Instead of sitting in the cornea as a foreign object, they integrate into it and become part of it. That biocompatibility is not a marketing line; it’s the mechanical reason the long-term stability data looks the way it does. Tissue that belongs there doesn’t fight the cornea around it.

What the long-term data shows

The headline: we have good data showing stability ten years after the procedure. Corneas reshaped with CAIRS hold their improvement, the segments stay where they were placed, and the flattening effect doesn’t fade the way patients often fear it will. Across eleven-plus years of worldwide experience, the pattern has been consistent enough that I discuss CAIRS with young patients as a long-term structural treatment, not a temporary fix.

Two things follow from that stability. First, your glasses or contact lens prescription has a stable foundation to sit on, instead of the moving target keratoconus usually makes of it. Second, and just as important, a stable cornea opens the door to further vision correction. Once we’ve confirmed the cornea is rock solid — at six months, and ideally twelve — CAIRS can be followed by topography-guided laser treatment, an implantable collamer lens, or cataract surgery when the time comes. Where keratoconus is still progressing, CAIRS is combined with corneal cross-linking to lock in the result.

And should your needs ever change, CAIRS keeps a rare option open: segments can be exchanged or removed. We almost never need to, but a structural procedure with a reverse gear is a comforting thing to carry through the decades.

The Brisbane contribution: a nomogram and a planning platform used worldwide

Long-term results don’t come from the segments alone. They come from putting the right size segment in the right place in the right cornea, every time. That’s the problem Dr Gunn and I have spent years working on, and it’s produced two resources that now guide CAIRS surgery well beyond Australia.

The first is the Brisbane nomogram, published in Clinical & Experimental Ophthalmology: a comprehensive, data-driven system for selecting and sizing femtosecond CAIRS segments based on the individual shape of each cornea. The second is CAIRSPlan, the free online planning platform we built so that any surgeon, anywhere, can plan a CAIRS case to the same standard — I’ve written about it in this post for surgeons, and we teach the technique internationally.

For you as a patient, the practical meaning is simple: when you have CAIRS in Brisbane, your surgery is planned with the same tools and the same nomogram that surgeons around the world now rely on, developed by the team doing your operation. Predictable planning is what turns good ten-year data into your good ten-year result.

The bottom line

CAIRS has moved well past the “promising new procedure” stage. Eleven years in, the segments integrate, the corneas stay stable, and the ten-year data backs up what the biology predicted: donor tissue lasts because it belongs there. If you want to know what the operation and the weeks afterwards actually feel like, read the companion guide on CAIRS recovery. The CAIRS treatment page covers the procedure itself, Medicare funding has its own post, and there’s a guide for patients travelling to Brisbane.

Whether CAIRS is right for your cornea comes down to your topography, your stage of keratoconus and your goals. Book a consultation and we’ll look at your maps together.