Corneal Transplant Surgery: When Is It Needed and What to Expect

The cornea — the clear, dome-shaped window at the front of the eye — is responsible for approximately two-thirds of the eye's focusing power. When disease, injury, or degeneration renders it irreversibly cloudy or misshapen, corneal transplant surgery (keratoplasty) may be the only route to restoring functional vision.

Modern corneal transplantation has evolved far beyond the traditional full-thickness graft. Today, surgeons can selectively replace only the damaged layers of the cornea, preserving as much healthy tissue as possible. The three most common approaches are penetrating keratoplasty (PK), deep anterior lamellar keratoplasty (DALK), and endothelial keratoplasty (DSAEK or DMEK).

Penetrating keratoplasty (PK) replaces the entire corneal thickness and is used when all layers are affected — for example, in severe keratoconus scarring or full-thickness corneal opacities from trauma. DALK selectively replaces the front layers while preserving the patient's own endothelium, reducing rejection risk. Endothelial keratoplasty (DMEK/DSAEK) replaces only the innermost endothelial layer, making it ideal for conditions like Fuchs endothelial dystrophy and bullous keratopathy.

Donor corneal tissue is supplied by the NHS Blood and Transplant Eye Banks, with rigorous screening and quality protocols ensuring the highest safety standards. Waiting times vary but are typically one to three months. All corneal transplant surgery at K Vision Centre is performed by Miss Tina Khanam under local or general anaesthesia as a day-case procedure.

Recovery from corneal transplant surgery requires patience. Unlike cataract surgery where vision improves within days, corneal grafts heal gradually over 6 to 18 months. Sutures used in PK and DALK may remain in place for 12 months or longer and are removed incrementally as the graft stabilises. DMEK offers faster visual recovery — often within weeks — because the smaller wound heals more rapidly.

Graft rejection is the primary risk and occurs when the immune system attacks the donor tissue. Signs include redness, sensitivity to light, decreased vision, and pain. Steroid eye drops are used long-term (often for life with PK grafts) to minimise this risk. The overall graft survival rate at five years is approximately 90% for PK and over 95% for DMEK, according to the National Corneal Transplant Registry.

Not all corneal conditions require transplant surgery. Early keratoconus can be stabilised with cross-linking, corneal scarring may be treated with phototherapeutic keratectomy (PTK), and Fuchs dystrophy in its early stages can be managed conservatively. Miss Khanam will exhaust less invasive options before recommending transplantation.

If you have been told you may need a corneal transplant, or if your vision is deteriorating despite current treatment, book a specialist consultation at K Vision Centre. Miss Khanam offers expert corneal assessment at Harley Street, Spire Gatwick Park, and Spire St Anthony's.