Cornea Transplant (Keratoplasty)

A cornea transplant replaces the diseased or damaged cornea, in whole or in part, with clear corneal tissue from a donor. The cornea is the transparent dome at the very front of the eye that focuses light onto the retina and shields the inside of the eye, so both its clarity and its smooth curve are essential for sharp vision. When disease or injury clouds or warps the cornea, replacing the affected tissue can restore the clear, focused image the eye has lost. Donor tissue is supplied and screened through eye banks, and modern surgery allows the surgeon to replace only the layer that is damaged rather than the full thickness whenever that is enough.

A transplant is considered when the cornea has lost so much transparency or shape that vision cannot be corrected by any other means. The most common reason is advanced keratoconus, where the cornea thins and bulges into a cone that glasses and lenses can no longer manage. It is also used for corneal scarring after infection, injury or a chemical burn, for hereditary corneal dystrophies such as Fuchs dystrophy, and for corneal swelling that does not settle, including the swelling that can follow earlier eye surgery such as a cataract operation. The decision rests on a careful examination and corneal scans that map the shape and thickness of the cornea and confirm that a graft is the best path forward.

The operation can be done under local anaesthesia with sedation or under general anaesthesia, and it usually takes about 45 to 90 minutes for one eye, longer if it is combined with another procedure. In a full-thickness transplant, called penetrating keratoplasty, the cloudy or misshapen central cornea is removed and a matching disc of donor cornea is stitched into place with very fine sutures. In partial-layer techniques only the affected layer is exchanged: deep anterior lamellar keratoplasty replaces the front layers while keeping the patient's own healthy inner cell layer, which lowers the risk of rejection, and endothelial keratoplasty replaces only the thin inner cell layer, often for dystrophies and persistent swelling, needing few or no stitches and giving a faster visual recovery. The surgeon chooses the technique that matches the diseased layer.

A suitable candidate has corneal disease that limits vision and a healthy enough eye behind the cornea to benefit from a clear graft, confirmed by a detailed eye examination and corneal imaging. Preparation reviews the cause of the corneal problem, any previous eye surgery, general health and the medicines being taken, and the eye is treated for any active infection or inflammation before surgery. For international patients much of this assessment can begin remotely from existing eye reports and scans, with the final examination, matching of donor tissue and scheduling completed after arrival. The surgeon also explains the aftercare and the eye-drop routine in advance, because consistent drops are central to a good result.

Most patients go home the same day or after one night, with the eye protected by a shield and a course of eye drops to prevent infection and calm inflammation. The first checks are done over the following days, and vision usually improves in stages: it often looks hazy at first and then sharpens over weeks to months as the graft settles and, where stitches were used, as they are adjusted or removed over time. For a trip abroad it is sensible to plan to stay in the destination city for about 7 to 10 days, so the early checks can confirm the graft is healthy and the eye is comfortable before flying. Air travel is generally safe once the surgeon gives clearance at that visit. Afterwards, follow-up continues remotely by message, photo or video, and international patient teams commonly arrange interpreters and coordinators so language is never a barrier, while routine local checks near home can support the long recovery.

In experienced hands a cornea transplant is a safe, well-established operation with a high success rate, helped by the fact that the cornea has no blood vessels. As with any eye surgery there are risks, including infection, raised eye pressure, bleeding, problems with the stitches and, less commonly, rejection of the donor cornea, which can occur even years later. The encouraging point is that early rejection usually shows clear warning signs, such as redness, light sensitivity or a drop in vision, and prompt treatment with drops most often controls it, which is exactly why long-term follow-up and steady use of the prescribed drops matter so much. Most patients gain a meaningful and lasting improvement in vision, and many who relied on a transplant for a clouded or coned cornea regain the clear sight they had lost.