Corneal Transplantation
A corneal transplant is a surgical procedure in which damaged corneal tissue is replaced with healthy donor corneal tissue. Depending on the condition, either the full thickness or selected layers of the cornea may be replaced.
What Is a Corneal Transplant?
A corneal transplant, also known as corneal graft surgery or keratoplasty, involves replacing damaged or diseased corneal tissue with healthy tissue obtained from a suitable human donor.
The cornea needs to remain clear and properly shaped for light to enter the eye and focus correctly. Scarring, swelling or structural abnormalities can interfere with this process and cause blurred or distorted vision.
Depending on the condition, an ophthalmologist may recommend:
- Full-thickness corneal transplantation
- Anterior or deep anterior lamellar transplantation
- Endothelial keratoplasty
The goal is not simply to replace tissue. The procedure is selected according to the specific corneal layer affected and the patient’s overall eye health.
When Is a Corneal Transplant Needed?
Keratoconus
Keratoconus causes the cornea to become thinner and progressively change shape. In advanced cases, corneal irregularity or scarring can significantly affect vision.
Corneal Scarring
A severe infection, injury or previous eye condition can leave scars on the cornea. If the scar is located in a visually important area and cannot be adequately treated by other methods, transplantation may be considered.
Corneal Dystrophies
Certain inherited or progressive corneal conditions can affect the transparency or function of specific corneal layers.
Corneal Swelling
Damage to the inner endothelial layer can cause fluid accumulation and corneal swelling, resulting in cloudy or blurred vision. Selected patients may benefit from an endothelial transplant rather than a full-thickness transplant.
Previous Eye Surgery or Injury
In some patients, corneal damage can occur following previous eye surgery or significant trauma. A corneal specialist can determine whether transplantation is appropriate.
Symptoms of Severe Corneal Disease
Corneal conditions can produce symptoms ranging from mild visual distortion to significant loss of vision.
Common symptoms include:
- Blurred or hazy vision
- Reduced clarity of vision
- Distorted vision
- Increased sensitivity to light
- Glare or halos
- Eye pain in some conditions
- Recurrent eye redness
- Difficulty wearing contact lenses
- Frequent changes in spectacle prescription
- Poor night vision
However, these symptoms do not automatically mean that you need a corneal transplant.
A comprehensive eye examination is necessary to identify the underlying condition and determine whether medication, contact lenses, laser treatment, corneal strengthening or another procedure may be more appropriate.
How Is a Corneal Transplant Diagnosed?
Before recommending corneal transplant treatment in Mohali, an ophthalmologist needs to understand the condition and determine which part of the cornea is affected.
Evaluation may include:
Visual Acuity Testing
The doctor checks how clearly you can see at different distances.
Refraction
A refraction determines whether glasses can adequately improve your vision.
Slit-Lamp Examination
A slit-lamp allows detailed examination of the cornea and other structures at the front of the eye.
Corneal Topography or Tomography
These tests can map the shape and thickness of the cornea and may be particularly useful in conditions such as keratoconus.
Corneal Thickness Measurement
Pachymetry measures corneal thickness and may provide important information when assessing certain corneal conditions.
Endothelial Evaluation
When the inner corneal layer is suspected to be affected, specialised testing may help evaluate endothelial cell health.
Types of Corneal Transplant
There is no single type of corneal transplant. The procedure is selected according to the affected corneal layers.
1. Penetrating Keratoplasty
Penetrating keratoplasty (PK) is a full-thickness corneal transplant.
The damaged central portion of the cornea is removed and replaced with healthy donor corneal tissue. It may be considered when damage involves multiple or all layers of the cornea.
Because more corneal tissue is replaced, visual recovery can take considerably longer than with some partial-thickness procedures.
2. Deep Anterior Lamellar Keratoplasty
DALK replaces the diseased front and middle layers while preserving the patient’s healthy inner endothelial layer.
It may be considered in selected conditions such as keratoconus where the deeper endothelial layer remains healthy.
3. Endothelial Keratoplasty
When disease primarily affects the innermost corneal layer, an endothelial keratoplasty may be considered.
Procedures include techniques such as:
- DSEK/DSAEK
- DMEK
These procedures replace selected inner corneal tissue rather than the entire cornea.
The choice depends on the diagnosis, corneal anatomy, disease severity and surgeon’s assessment.
Corneal Transplant Procedure
Before surgery, your ophthalmologist will explain:
- Why a transplant may be necessary.
- Which part of the cornea is affected.
- Which transplant technique may be appropriate.
- Expected benefits and limitations.
- Possible complications.
- Postoperative medication and follow-up requirements.
During surgery, the damaged corneal tissue is removed and healthy donor tissue is positioned in its place.
Depending on the procedure, donor tissue may be secured using sutures or other techniques. The type of anaesthesia depends on the surgery and patient.
Corneal transplant surgery is often performed as a day-care procedure, although individual arrangements can vary.
Corneal Transplant Recovery and Aftercare
Recovery after a corneal transplant is gradual.
The recovery period depends significantly on the type of transplant. Some partial-thickness procedures can recover more quickly, while full-thickness transplantation may require many months and sometimes a year or longer for vision to stabilise.
After surgery, patients may be advised to:
- Use prescribed eye drops exactly as directed.
- Avoid rubbing or pressing on the eye.
- Protect the eye with glasses or a shield when advised.
- Attend every follow-up appointment.
- Avoid swimming or contact sports until cleared by the doctor.
- Avoid driving until vision meets legal requirements and the doctor permits it.
- Follow all postoperative instructions carefully.
Some patients continue to need glasses or contact lenses after surgery because the new cornea may not produce completely regular optical focusing.
Risks and Possible Complications
Like any eye surgery, corneal transplantation carries potential risks.
Possible complications include:
- Corneal transplant rejection
- Infection
- Inflammation
- Increased eye pressure or glaucoma
- Astigmatism
- Problems with the donor graft
- Graft failure
- Retinal complications in some cases
- Need for additional treatment or repeat transplantation
One important complication is corneal graft rejection.
Warning signs can include:
- Redness
- Eye pain
- Increased sensitivity to light
- Cloudy or hazy vision
These symptoms after a corneal transplant should be reported to an eye doctor promptly because early treatment may help manage rejection.
FAQs
What is a corneal transplant?
A corneal transplant is surgery that replaces damaged or diseased corneal tissue with healthy donor corneal tissue. Depending on the condition, either the whole cornea or selected layers may be replaced.
Who needs a corneal transplant?
People with severe corneal disease, scarring, swelling or structural damage that cannot be adequately managed with other treatments may be considered for transplantation. Conditions can include advanced keratoconus, corneal scarring and certain corneal dystrophies.
What are the different types of corneal transplant?
The main approaches include penetrating keratoplasty, deep anterior lamellar keratoplasty and endothelial keratoplasty. The choice depends on which corneal layers are damaged.
How long does it take to recover after a corneal transplant?
Recovery varies considerably according to the type of transplant. Some partial-thickness procedures recover faster, while full-thickness transplantation may require many months or longer for vision to stabilise.
Can a corneal transplant restore vision completely?
A transplant can improve vision in appropriate patients, but the final visual result varies. Other eye conditions, corneal shape, healing, astigmatism and the underlying disease can affect the outcome.