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What Is the Rejection Rate of Corneal Transplants?

The cornea is the most successfully transplanted tissue in the human body. For a standard, low-risk patient (someone with no blood vessels growing into their cornea), the risk of rejection for a full-thickness transplant (Penetrating Keratoplasty) is approximately 10% to 20%. However, for newer partial-thickness procedures like DMEK (Descemet Membrane Endothelial Keratoplasty), the rejection rate is significantly lower, often cited as less than 1% to 5%. It is crucial to distinguish between "rejection" (the immune system attacking) and "failure" (the graft dying). Approximately 90% of rejection episodes can be stopped and reversed with steroid drops if caught early, meaning rejection does not automatically equal blindness.

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What Is the Rejection Rate of Corneal Transplants?

The cornea is the most successfully transplanted tissue in the human body. For a standard, low-risk patient (someone with no blood vessels growing into their cornea), the risk of rejection for a full-thickness transplant (Penetrating Keratoplasty) is approximately 10% to 20%. However, for newer partial-thickness procedures like DMEK (Descemet Membrane Endothelial Keratoplasty), the rejection rate is significantly lower, often cited as less than 1% to 5%. It is crucial to distinguish between "rejection" (the immune system attacking) and "failure" (the graft dying). Approximately 90% of rejection episodes can be stopped and reversed with steroid drops if caught early, meaning rejection does not automatically equal blindness.

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Why Is the Success Rate So High? (Immune Privilege)

Unlike a kidney or heart transplant, a corneal transplant usually does not require tissue matching or heavy oral anti-rejection pills. This is because the cornea is avascular (it has no blood vessels). Without blood vessels, the white blood cells of the immune system have no "highway" to reach the graft and attack it. This unique biological status is known as immune privilege. However, if a patient has a severe injury or infection that causes blood vessels to grow into the cornea (neovascularization) before surgery, this privilege is lost, and the rejection risk can skyrocket to 50% or higher.

Transplant Longevity: 5 vs. 10 Years

While early success is high, grafts do not last forever. The endothelial cells (the pumps that keep the cornea clear) naturally die off over time at a faster rate in transplanted eyes than in healthy eyes.

1-Year Survival - ~90% of grafts are clear and functioning.

5-Year Survival - ~70% to 75% for full-thickness grafts.

10-Year Survival - ~60% often remain clear. When a graft eventually fails due to age (late failure), it can usually be replaced with a new transplant.

The "RSVP" Warning Signs

Because rejection can happen weeks, months, or even 20 years after surgery, patients are taught the acronym RSVP to monitor their own eye health daily:

Redness. Does the eye look pink or angry?

Sensitivity. Does light hurt more than usual?

Vision. Has the vision become foggy or blurry?

Pain. Is there a dull ache or throbbing sensation? If any of these occur, it signifies an active immune attack.

Types of Rejection

Rejection can occur in any of the three layers of the cornea. Epithelial rejection (surface) is often mild and asymptomatic. Stromal rejection (middle) causes haze. Endothelial rejection (bottom layer) is the most severe. Because the endothelial cells do not regenerate, an attack here permanently kills the cells needed to keep the cornea clear. This is why immediate treatment with corticosteroids is mandatory.

FAQs on Corneal Rejection

Do I need to match blood type?

Generally, no. Because of immune privilege, ABO blood typing is rarely performed for routine corneal transplants. However, in "high-risk" cases (previous failed grafts), doctors may try to match tissues to improve the odds.

Can it be treated?

Yes. Rejection is treated with intensive steroid eye drops (sometimes every hour). In severe cases, oral steroids or a periocular injection may be used. Most grafts recover clarity if treated within days.

Does the donor age matter?

Surprisingly, minimal data supports this. The Cornea Donor Study found that grafts from donors over age 65 had success rates nearly identical to grafts from younger donors for the first 5 years.

When to See Your Eye Doctor

Time is vision. If you have had a corneal transplant and notice any of the "RSVP" symptoms, do not wait until the next morning. Call your surgeon immediately. A rejection episode treated within 24 hours often results in zero permanent damage, while one left for a week often leads to total graft failure.

References

https://www.cornea.org/Learn-About-Cornea/Cornea-Transplants/Rejection-Risks.aspx

https://www.aao.org/eye-health/treatments/corneal-transplant-surgery-options

https://pubmed.ncbi.nlm.nih.gov/18294691/

https://www.nei.nih.gov/learn-about-eye-health/eye-conditions-and-diseases/corneal-conditions/corneal-transplantation