A corneal transplant is a surgical procedure that replaces a damaged or diseased cornea with healthy donor tissue, restoring vision and comfort. Statistics suggest that over 185,000 corneal transplants are performed annually, making it the most common and successful type of organ transplant.
In India, the need for corneal transplantation is vast, with an estimated 120,000 people waiting for surgery each year, yet only 25,000-30,000 procedures are performed annually due to donor shortages.
This vital operation involves a multidisciplinary team: cornea specialists, ophthalmic surgeons, anesthesiologists, and eye bank coordinators. The treatment journey includes detailed preoperative evaluation, surgery, post-operative care, and long-term monitoring.
Effectiveness and long-term success rates depend on factors such as the underlying eye condition, the type of transplant performed, the quality of donor tissue, and the patient’s adherence to follow-up care and prescribed medications.
This think-piece provides a step-by-step understanding of corneal transplants, starting with an overview, definition, and patient eligibility. It further explains surgical types, treatment process, effectiveness, cost, and top centres in India, then concludes with risks and alternatives. The goal of this article is to help patients and families make informed decisions about corneal transplants.
What is a Corneal Transplant?
A corneal transplant is a surgical method where a damaged or diseased cornea is replaced with healthy donor tissue to improve vision and relieve pain. The cornea, the transparent front layer of the eye, plays a crucial role in focusing light onto the retina, making clear vision possible. When the cornea becomes cloudy, scarred, or misshapen, vision deteriorates significantly, sometimes leading to blindness if left untreated.
Corneal transplantation, also called keratoplasty, directly addresses this loss of transparency or structure. The surgeon removes part or all of the affected cornea and implants donor tissue to restore the eye’s optical clarity.
This approach is often the final option when other treatments, like medications or specialized lenses, fail to provide relief or restore sight. Advances in surgical techniques and postoperative care have made corneal transplantation more successful and accessible than ever, offering hope to those with severe corneal disease.
Who Needs a Corneal Transplant?
Individuals typically require a corneal transplant when they experience significant vision loss, persistent ocular pain, or structural abnormalities in the cornea due to severe damage or disease. The following conditions are the most common indications:
- Keratoconus: A progressive eye disorder where the cornea becomes thinner and adopts a cone-like shape. This deformation distorts vision and often renders glasses or contact lenses ineffective.
- Fuchs’ Endothelial Dystrophy: A hereditary condition characterized by the gradual deterioration of endothelial cells in the cornea. As these cells die off, fluid builds up, causing swelling (corneal edema), cloudiness, and progressive vision loss.
- Corneal Scarring: Permanent opacities in the cornea caused by traumatic injuries, untreated infections, or inflammatory conditions such as herpes simplex keratitis. These scars obstruct light entry and severely impair vision.
- Corneal Ulcers: Open sores on the cornea that fail to respond to medical therapy. Such ulcers can destroy tissue and compromise the structural integrity of the eye, making surgical intervention necessary.
- Failed Previous Corneal Transplant: Individuals who have undergone a previous cornea transplant that failed due to rejection or other complications often need a repeat surgery to restore vision and comfort.
What are the Different Types of Corneal Transplant?
Corneal transplant procedures are classified into four main types: penetrating keratoplasty, deep anterior lamellar keratoplasty, endothelial keratoplasty, and artificial cornea implantation.
The choice of procedure depends on the specific layers of the cornea that are damaged and the underlying cause of visual impairment. Each technique targets a different depth of corneal tissue and is selected based on clinical indications. The benefits, risks, and surgical complexity vary across procedures, and the final decision is determined by both the patient’s condition and the surgeon’s clinical judgment. A brief description of each is given below.
1. Penetrating Keratoplasty
Penetrating keratoplasty (PK) is a full-thickness transplant in which the surgeon removes the entire central portion of the damaged cornea and replaces it with a clear, healthy donor cornea.
This traditional approach is most often used for conditions where all layers of the cornea are affected, such as advanced keratoconus, dense scarring, or severe corneal swelling. The surgeon makes a circular incision in the cornea, takes out the diseased tissue, and sutures the donor graft in place with ultra-fine stitches.
The healing process after PK is lengthy, often requiring several months to a year for the eye to stabilize before final vision correction.
The risk of complications such as rejection, high astigmatism, and infection is higher compared to partial-thickness procedures, but PK remains the gold standard when complete corneal replacement is necessary. Long-term success rates for PK are high, with many patients regaining significant visual function and comfort.
2. Deep Anterior Lamellar Keratoplasty
Deep anterior lamellar keratoplasty (DALK) is a partial-thickness transplant where only the front and middle layers of the cornea are replaced, preserving the patient’s healthy inner lining.
This technique is ideal for patients with diseases limited to the outer layers, such as keratoconus or superficial scars, where the innermost layer, the endothelium, remains healthy. It retains the patient’s own endothelium, substantially reducing the risk of graft rejection.
During DALK, the surgeon carefully removes the diseased corneal tissue down to the Descemet’s membrane, then positions the donor tissue and secures it with sutures.
Recovery from DALK is often faster than from full-thickness transplants, and the structural strength of the eye is better maintained. Visual outcomes are excellent, especially with newer surgical tools and techniques that allow for precise removal and placement of tissue.
3. Endothelial Keratoplasty
Endothelial keratoplasty (EK) is a minimally invasive procedure where only the innermost layer of the cornea, the endothelium, is replaced with healthy donor cells. EK is primarily indicated for conditions like Fuchs’ dystrophy and other forms of endothelial failure, where the rest of the cornea remains unaffected.
The two most common variations are Descemet’s Stripping Endothelial Keratoplasty (DSEK) and Descemet’s Membrane Endothelial Keratoplasty (DMEK).
In EK, the surgeon removes the dysfunctional endothelial layer and inserts a thin disc of donor tissue through a small incision, minimizing disruption to the eye’s structure. The graft is held in place by an air bubble until it attaches naturally.
Recovery is quicker, with fewer stitches and a lower risk of complications such as infection or astigmatism. Patients usually experience faster improvement in vision and less discomfort than with traditional full-thickness procedures.
4. Artificial Cornea
An artificial cornea, or keratoprosthesis, is a synthetic implant used when standard donor transplants are not possible or have repeatedly failed. Indications include severe ocular surface disease, repeated graft rejection, or complex scarring where finding a suitable donor tissue is difficult.
The Boston Keratoprosthesis is the most widely used artificial cornea worldwide, offering a lifeline for patients with otherwise untreatable blindness.
Implantation of a keratoprosthesis involves removing the damaged cornea and inserting a clear device designed to integrate with the eye’s natural tissues. These devices restore vision in patients who would otherwise have no hope of sight, but they require lifelong monitoring for complications such as infection or device extrusion.
The procedure is considered a last resort, but for eligible patients, artificial corneas provide dramatic improvement in quality of life and independence.
How does a Corneal Transplant Work?
A corneal transplant works by surgically removing the damaged or diseased portion of the cornea and replacing it with healthy donor tissue, thereby restoring vision and comfort. This complex process unfolds in three main stages: before, during, and after the surgical procedure, with each phase being crucial to ensuring the best visual outcome and minimizing complications.
Before the Treatment
Before a corneal transplant, patients undergo thorough evaluations and preparation to optimize the chances of a successful surgery. An ophthalmologist examines the eye in detail, using tools like a slit lamp and corneal imaging (Pentacam and ASOCT) to assess the extent of damage and determine the most suitable transplant method.
Blood tests, general health checkups, and sometimes imaging studies help identify any underlying conditions that could impact the procedure or healing process.
The patient receives counselling about the risks, benefits, and alternatives to transplantation, ensuring realistic expectations and emotional readiness. Eye banks play a vital role in sourcing and screening donor tissue to guarantee its safety and suitability. Instructions are given regarding medications, fasting, and hygiene in the days leading up to surgery, and arrangements for post-operative care are discussed to facilitate smooth recovery.
During the Treatment
During a corneal transplant, the surgeon carefully removes the affected corneal tissue and secures the donor graft using specialized microsurgical techniques. The procedure is performed in a sterile operating room under local or general anaesthesia, depending on the patient’s age, health, and preferences. The surgical technique, full-thickness or partial-thickness, depends on the underlying diagnosis.
Precision instruments are used to create a circular opening in the diseased cornea and to prepare the donor tissue for transplantation. The new cornea is positioned with meticulous alignment and attached with ultra-fine sutures or, in some cases, by using an air bubble for internal support.
The process is monitored throughout to ensure the graft sits correctly and complications are avoided. The surgery typically lasts from one to two hours, after which the patient is monitored in recovery before being sent home or admitted for observation.
After the Treatment
After a corneal transplant, ongoing care and monitoring are essential to ensure the graft heals properly and vision improves as expected. Patients use prescribed eye drops to prevent infection, control inflammation, and reduce the risk of rejection. Regular follow-up visits with the ophthalmologist track healing progress, detect complications early, and allow for timely intervention if issues arise.
Stitches are usually left in place for several months, sometimes up to a year, before removal is considered. The vision often fluctuates during initial recovery, stabilizing gradually as the eye heals.
Patients are guided on activity restrictions, eye protection, and the importance of prompt reporting if symptoms like redness, pain, or sudden vision changes occur. With diligent care, most recipients achieve substantial improvements in vision and quality of life.
How Effective is a Corneal Transplant?
Corneal transplant is one of the most effective organ transplants, with high success rates and the ability to restore sight in people with severe corneal disease or blindness.
Globally, corneal blindness is the fourth leading cause of blindness, affecting over 10 million people, and transplantation offers the only hope for many of these individuals. In India alone, an estimated 1.2 million people live with corneal blindness in at least one eye, underscoring the enormous impact of this intervention.
Success rates for corneal transplantation vary depending on the underlying condition, the type of surgery performed, and the patient’s overall health. For uncomplicated cases like keratoconus or Fuchs’ dystrophy, graft survival exceeds 90% to 100 %at one year and remains above 70% even after 10 years.
Advances in surgical techniques, tissue preservation, and immunosuppressive therapies have steadily improved outcomes, making rejection and failure less common than in the past.
How much does a Corneal Transplant Cost?
The cost of a corneal transplant in India typically ranges from Rs. 40,000 to Rs. 1,50,000 per eye, depending on the hospital, surgeon’s experience, and complexity of the case. This figure includes charges for the surgical procedure, donor tissue procurement, anaesthesia, hospital stay, and immediate post-operative care. Government and charitable hospitals often offer lower pricing or subsidized rates, sometimes as low as Rs. 20,000, especially for economically disadvantaged patients.
Private hospitals and specialized eye centers have higher fees, reflecting advanced facilities, cutting-edge technology, and experienced surgeons. The cost of donor corneal tissue, sourced from certified eye banks, usually forms a significant part of the total expense, ranging between Rs. 10,000 and Rs. 40,000. Pre-operative tests, medications, and follow-up visits contribute further to the overall cost, and these must be factored into the patient’s financial planning.
What are the Best Corneal Transplant Centres?
The best corneal transplant centres in India include Narayana Nethralaya, Eye7 Eye Hospitals, Sankara Nethralaya, L V Prasad Eye Institute, and Aravind Eye Care System. These institutions are renowned for their high surgical success rates, advanced technology, and experienced teams of cornea specialists. For a brief description of each, keep reading below:
- Narayana Nethralaya (Bengaluru): This centre houses a tertiary-level cornea department with advanced diagnostic and surgical facilities and performs the full spectrum of keratoplasty procedures.
- Eye7 Eye Hospitals (New Delhi): A leading centre for corneal transplants with expertise in keratoconus management and advanced keratoplasty procedures. The hospital integrates a dedicated cornea service with modern diagnostics, excimer laser support, and access to donor tissue through established eye banking networks.
- Sankara Nethralaya (Chennai/Kolkata): The institute operates one of India’s oldest and largest cornea units, supported by the C U Shah Eye Bank.
- L V Prasad Eye Institute (Hyderabad/Vizag/Bhubaneswar): It has performed more than 50,000 corneal transplants and maintains one of the world’s largest cornea programs.
- Aravind Eye Care System (Madurai/Coimbatore/Chennai): One of the largest eye care systems globally. Its cornea service integrates microbiology, outreach programs, and extensive eye donation initiatives.
What are the Risks & Side Effects of Corneal Transplant?
Corneal transplant, while highly successful, carries risks and side effects including graft rejection, infection, vision fluctuations, astigmatism, and possible graft failure.
Graft rejection is the most serious complication, occurring when the immune system attacks the transplanted tissue. Early signs of rejection include redness, sensitivity to light, pain, and sudden blurring of vision.
Infection is another risk, both immediately after surgery and in the months that follow. Strict hygiene, prescribed antibiotic drops, and close monitoring can reduce this risk. However, patients are instructed to seek help if they notice increased discharge, swelling, or severe discomfort. Despite best efforts, rare cases of severe infection result in loss of the graft or, in extreme situations, the eye itself.
Vision fluctuations are common in the initial months after surgery, as the eye heals and stitches settle. Irregular curvature of the cornea leads to astigmatism, making vision blurry or distorted until corrective glasses or contact lenses are prescribed.
Graft failure, where the new tissue becomes cloudy or fails to integrate, occurs in a minority of cases. Causes include chronic rejection, infection, or recurrence of the original disease. Repeat transplantation is possible, but with lower success rates and higher risks.
What are the Alternatives to Corneal Transplant?
Alternatives to corneal transplant include medical management, specialty contact lenses, laser treatments, and newer regenerative techniques, each suited to specific types and severities of corneal disease.
For early or mild cases of corneal disease, medications like lubricating drops, anti-inflammatory drugs, and antibiotics help control symptoms and prevent progression. These approaches are often used in combination with lifestyle changes, protective eyewear, and close monitoring.
Specialized contact lenses, such as scleral or rigid gas-permeable lenses, restore vision by providing a smooth optical surface over an irregular cornea. These lenses are especially effective for keratoconus or scarring, where standard glasses fail to correct vision. Fitting and adaptation require expertise, but many patients achieve functional vision and avoid surgery for years.
Laser treatments, including phototherapeutic keratectomy (PTK), use precisely controlled laser energy to remove superficial scars or opacities, restoring clarity without the need for tissue replacement. PTK is suitable for selected patients with surface-level disease and minimal underlying structural changes.
Resources
- https://pmc.ncbi.nlm.nih.gov/articles/PMC8904759/
- https://www.civilsdaily.com/27th-november-2024-the-hindu-op-ed-an-ideal-way-to-treat-indias-corneal-blindness-problem/
- https://journals.lww.com/corneajrnl/fulltext/2015/10001/corneal_transplantation_in_the_developing_world_.6.aspx
- https://journals.lww.com/md-journal/fulltext/2019/04260/risk_factors_for_graft_failure_after_penetrating.34.aspx