Corneal Transplant for Keratoconus
Keratoconus can progressively change the shape and strength of the cornea. For advanced disease, corneal transplantation may become necessary—but modern treatment is increasingly focused on detecting progression early, strengthening the cornea and preserving as much natural tissue as possible.
What Is Keratoconus?
The cornea is the transparent, curved tissue covering the front of the eye. It provides a major portion of the eye's focusing power and must maintain a precise shape for clear vision.
In keratoconus, the normally smooth and relatively regular cornea becomes progressively weaker and irregular. Instead of maintaining its normal dome-like shape, a portion of the cornea may progressively protrude forward, producing the characteristic cone-like appearance associated with the disease.
Keratoconus is now generally described as a corneal ectatic disorder. It should not be thought of simply as a condition in which the cornea becomes thin. Changes in corneal curvature, biomechanics, thickness distribution and anterior and posterior corneal shape are all important.
- Progressive corneal steepening
- Localized corneal thinning
- Irregular astigmatism
- Increasing myopia
- Distorted or fluctuating vision
- Glare and halos
- Difficulty seeing at night
- Increasing difficulty fitting contact lenses
- Corneal scarring in advanced disease
The disease does not progress at exactly the same rate in every patient. Some people experience relatively slow changes, while others—particularly younger patients—can experience much faster progression.
Modern keratoconus assessment relies heavily on corneal topography and tomography rather than visual acuity alone. Ophthalmologists may examine parameters including corneal curvature, Kmax, posterior elevation, pachymetric distribution, corneal volume and other tomographic characteristics.
Why Does Keratoconus Cause Poor Vision?
The problem is not simply that the cornea becomes thin. One of the major optical problems is that the corneal surface becomes increasingly irregular.
In early keratoconus, spectacles may still provide useful vision. As the corneal surface becomes more irregular, however, ordinary spectacle lenses cannot completely compensate for the complex optical distortions.
- Letters may appear distorted.
- Straight lines may appear bent or irregular.
- Lights may develop halos or glare.
- Night driving can become difficult.
- Vision may fluctuate.
- One eye may become considerably worse than the other.
- Increasing spectacle power may provide progressively less improvement.
Specialty contact lenses—including rigid gas-permeable, hybrid and scleral lenses—can sometimes create a much more regular optical surface over an irregular cornea.
However, in some advanced cases the cornea becomes so steep, irregular or scarred that contact lenses may no longer provide adequate vision or may become extremely difficult to fit and tolerate.
Does Every Patient With Keratoconus Need a Corneal Transplant?
Many people with keratoconus can maintain useful vision for many years without undergoing corneal transplantation. Treatment depends on disease severity, progression, corneal shape, visual function and the patient's response to less invasive treatments.
Factors that may influence treatment decisions include:
- Age
- Severity of keratoconus
- Evidence of progression
- Corneal thickness
- Corneal shape
- Visual acuity
- Degree of irregular astigmatism
- Presence of corneal scarring
- Ability to tolerate contact lenses
- Quality of vision
- Previous treatments
- Condition of the corneal endothelium
The modern objective is to intervene before irreversible structural damage becomes severe.
The second edition of the Global Consensus on Keratoconus and Ectatic Diseases, published in 2026, emphasizes an integrated approach involving diagnosis, staging, progression assessment, cross-linking, visual rehabilitation and surgical treatment.
When Is a Corneal Transplant Needed for Keratoconus?
Corneal transplantation is generally considered when the patient's vision can no longer be adequately rehabilitated with less invasive approaches or when severe structural damage makes transplantation appropriate.
1. Severe irregular corneal shape
The cornea may become so steep and irregular that spectacles no longer provide functional vision.
2. Contact lenses no longer provide useful vision
Specialty lenses may become extremely difficult to fit because of the altered corneal geometry.
3. Contact-lens intolerance
Some patients cannot tolerate specialty lenses because of discomfort, ocular-surface problems or other complications.
4. Significant corneal scarring
Advanced keratoconus can produce stromal scarring, particularly after episodes of acute corneal hydrops.
5. Extreme corneal thinning
Very advanced ectasia may create structural problems that cannot be adequately managed through conventional optical rehabilitation.
6. Acute corneal hydrops with persistent visual impairment
Acute hydrops occurs when a break develops in Descemet's membrane, allowing aqueous fluid to enter the corneal stroma and causing sudden corneal edema. The episode may eventually resolve, but significant scarring can remain.
7. Failure of other treatments
When stabilization and optical rehabilitation are no longer sufficient, a corneal transplant may become appropriate.
Can Corneal Cross-Linking Prevent a Corneal Transplant?
In appropriately selected patients, corneal cross-linking (CXL) has changed the management of progressive keratoconus.
CXL is fundamentally different from spectacles and contact lenses. Glasses and contact lenses primarily improve the optical quality of vision, while CXL is designed to increase corneal biomechanical strength and slow or halt progression.
During conventional epithelium-off CXL, the corneal epithelium is removed, riboflavin is applied and the cornea is exposed to controlled ultraviolet-A light. The resulting photochemical reaction promotes additional collagen cross-linking within the corneal tissue.
CXL cannot necessarily reverse advanced structural damage that has already occurred. Its major purpose is to prevent or slow further progression in appropriate patients.
A Major New Development: Epithelium-On Cross-Linking
One of the important recent developments in keratoconus treatment occurred in October 2025, when the FDA approved Epioxa and Epioxa HD for epithelium-on corneal collagen cross-linking in specified patients with keratoconus.
Traditional CXL generally involves removal of the corneal epithelium. Epithelium-on approaches are designed to deliver treatment without removing the epithelium.
Avoiding epithelial removal has the potential to reduce some of the discomfort and epithelial-healing issues associated with conventional epithelium-off procedures. However, different CXL protocols should not be treated as interchangeable. Patient selection and the specific treatment technology remain critically important.
What Is a Corneal Transplant?
A corneal transplant, also called corneal grafting or keratoplasty, involves replacing diseased corneal tissue with healthy donor corneal tissue.
The donated tissue comes from a human donor through an authorized eye bank. The surgeon removes the required portion of abnormal corneal tissue and places the donor tissue in its position.
Modern corneal transplantation is no longer limited to replacing the entire cornea. Depending on which layers are affected, surgeons can selectively replace particular layers.
Replace only the tissue that actually needs to be replaced.
For keratoconus, the two major transplantation procedures are:
- Deep Anterior Lamellar Keratoplasty (DALK)
- Penetrating Keratoplasty (PK)
What Is DALK?
Deep Anterior Lamellar Keratoplasty (DALK) is a partial-thickness corneal transplant.
In DALK, the surgeon removes diseased anterior corneal tissue while preserving the patient's Descemet's membrane and corneal endothelium.
Healthy donor stromal tissue is then positioned over the preserved deeper layers.
Keratoconus primarily affects the corneal shape and stromal architecture, while the deeper endothelial cells are often healthy. DALK allows the surgeon to replace diseased stromal tissue while preserving the patient's own endothelium.
Why Is Preserving the Endothelium Important?
The corneal endothelium is a thin layer of specialized cells located on the inner surface of the cornea.
These cells help maintain the appropriate hydration and transparency of the cornea.
Human corneal endothelial cells have limited regenerative capacity. Preserving healthy native endothelial cells can therefore be an important advantage.
With a full-thickness transplant, donor endothelial cells are introduced into the eye. This creates the possibility of endothelial immune rejection.
Because DALK retains the patient's own endothelium, it eliminates the risk of endothelial rejection.
What Is Penetrating Keratoplasty?
Penetrating Keratoplasty (PK) is a full-thickness corneal transplant.
During PK, a circular portion containing essentially the full thickness of the central cornea is removed and replaced with a donor corneal button. The graft is usually secured using extremely fine sutures.
PK has been performed for many decades and remains an important operation for advanced corneal disease.
Although DALK is frequently preferred for suitable keratoconus patients, PK remains appropriate in certain situations.
- Deep corneal scarring
- Severe damage involving deeper corneal layers
- Previous acute hydrops with significant structural damage
- Anatomy unsuitable for successful DALK
- Intraoperative complications requiring conversion
- Other surgeon-determined indications
DALK vs PK: Which Is Better for Keratoconus?
There is no single operation that is best for every patient. The choice depends on the anatomy and condition of the individual cornea.
| Feature | DALK | PK |
|---|---|---|
| Type | Partial-thickness transplant | Full-thickness transplant |
| Native endothelium | Preserved | Replaced by donor endothelium |
| Endothelial rejection | Eliminated | Possible |
| Technical difficulty | High | Established technique |
| Deep corneal scarring | May be unsuitable | Can be appropriate |
| Keratoconus | Often attractive when anatomy is suitable | Useful when DALK is unsuitable |
Recent evidence-based guidance conditionally favors DALK over PK for severe keratoconus when the patient is an appropriate DALK candidate, particularly because DALK preserves the recipient endothelium and avoids endothelial rejection. However, the evidence is not strong enough to make DALK universally superior for every eye.
How Is DALK Performed?
Several surgical approaches are available. One of the best-known techniques is the big-bubble technique.
The surgeon creates a deep plane within the corneal stroma and introduces air to separate deeper stromal tissue from Descemet's membrane.
The diseased anterior stromal tissue can then be removed and donor tissue placed over the preserved deeper corneal layer.
Another approach is manual dissection, in which the surgeon carefully separates the corneal layers without relying on a large air bubble.
The choice depends on corneal anatomy, surgical expertise and intraoperative findings.
What Are the Risks of DALK?
DALK is an advanced surgical procedure and is not risk-free.
- Descemet's membrane perforation
- Interface haze
- Interface infection
- Double anterior chamber
- Stromal graft rejection
- Persistent astigmatism
- Elevated intraocular pressure
- Infection
- Graft failure
- Visual disturbances
One of the most important intraoperative complications is accidental perforation of Descemet's membrane.
Depending on the size and location of the perforation, the surgeon may be able to continue with DALK or may need to convert the operation to a full-thickness PK.
What Are the Risks of Penetrating Keratoplasty?
Because PK replaces the full thickness of the cornea, it has a broader complication profile.
- Graft rejection
- Graft failure
- Infection
- Wound problems
- Irregular astigmatism
- High refractive error
- Elevated intraocular pressure
- Glaucoma
- Cataract
- Corneal neovascularization
- Delayed visual rehabilitation
- Suture-related complications
- Traumatic wound dehiscence
Keratoconus is generally considered a relatively favorable indication for corneal transplantation because many patients have otherwise healthy eyes.
What Is Corneal Graft Rejection?
Corneal graft rejection occurs when the recipient's immune system recognizes donor corneal tissue as foreign and mounts an immune response.
It is important to distinguish graft rejection from graft failure.
| Condition | Meaning |
|---|---|
| Graft rejection | An immune-mediated response against donor tissue. |
| Graft failure | Loss of graft clarity or function, which can have several causes. |
Not every graft failure is caused by immune rejection. Endothelial dysfunction, infection, surgical complications and other problems can also lead to graft failure.
Symptoms of Corneal Graft Rejection
Patients who have undergone corneal transplantation should know the warning symptoms of possible graft rejection.
Sudden redness, increased light sensitivity, pain or worsening vision after a corneal transplant requires prompt ophthalmic assessment. These symptoms do not prove rejection, but delaying evaluation can be dangerous.
Rejection can occur months or even years after transplantation. Early diagnosis and treatment may sometimes prevent irreversible graft failure.
Can DALK Still Have Graft Rejection?
Yes.
Because DALK preserves the patient's own endothelium, endothelial rejection is eliminated. However, transplanted stromal tissue can still produce an immune response.
Therefore, patients with DALK should still recognize warning symptoms and maintain appropriate postoperative follow-up.
What Happens After a Corneal Transplant?
Recovery is gradual. A corneal transplant is not comparable to simply changing a spectacle prescription.
The eye needs time to heal and the cornea may initially be blurry or distorted.
- Fluctuating vision
- Light sensitivity
- Foreign-body sensation
- Redness
- Refractive changes
- Astigmatism
Vision may progressively improve as inflammation decreases, the cornea heals, sutures are adjusted or removed and the graft becomes more optically stable.
Will I Still Need Glasses After a Corneal Transplant?
Many patients still require glasses or contact lenses after transplantation. Residual myopia, hyperopia or astigmatism may remain even when the graft is completely clear.
Some patients eventually achieve excellent vision with spectacles. Others may benefit from rigid gas-permeable or scleral contact lenses after the cornea stabilizes.
Needing a contact lens after a successful transplant does not necessarily mean that the transplant failed.
How Long Does Vision Take to Improve After Corneal Transplant?
There is no single recovery timetable that applies to every patient.
Vision may remain significantly blurred during the early postoperative period and then gradually improve.
Recovery depends on:
- Type of transplant
- Corneal healing
- Graft clarity
- Suture-related astigmatism
- Inflammation
- Residual refractive error
- Ocular surface health
- Presence or absence of complications
Corneal transplantation often requires patience. The visual result can continue to evolve for a prolonged period while the cornea heals and its shape stabilizes.
Can Keratoconus Come Back After a Corneal Transplant?
True recurrence of keratoconus in donor corneal tissue is considered uncommon. However, patients can still experience long-term refractive problems, irregular astigmatism and other corneal changes.
A transplant does not make the eye biologically identical to an unaffected eye. Long-term ophthalmic monitoring remains important.
The New Era of Keratoconus Treatment
One of the most interesting developments in modern corneal medicine is the shift away from viewing transplantation as the only major surgical solution for advanced keratoconus.
Researchers are increasingly exploring ways to:
- Strengthen the existing cornea
- Reshape the cornea
- Add structural tissue
- Preserve native corneal layers
- Improve biomechanical stability
- Improve optical quality
- Delay or potentially avoid transplantation in selected patients
Corneal Allogeneic Intrastromal Ring Segments — CAIRS
One of the most interesting newer approaches is Corneal Allogeneic Intrastromal Ring Segments (CAIRS).
Traditional intracorneal ring segments use synthetic material. CAIRS instead uses appropriately prepared donor corneal tissue segments implanted within the corneal stroma.
The concept is remarkably different from conventional transplantation: instead of removing the entire abnormal cornea, biological tissue is added strategically to alter corneal shape and potentially improve biomechanical behavior.
Studies and reviews have reported improvements in selected patients involving visual acuity, corneal curvature, astigmatism and topographic parameters. However, CAIRS remains an evolving treatment and should not currently be presented as a universal replacement for DALK or PK.
Why Is CAIRS So Important?
CAIRS represents a broader conceptual change in corneal surgery.
| Traditional concept | Emerging concept |
|---|---|
| Disease → remove tissue → replace tissue | Disease → reinforce tissue → reshape tissue → preserve native structures |
This approach is particularly interesting in keratoconus because the disease involves abnormal corneal biomechanics.
Bowman Layer Transplantation
Another tissue-sparing approach being investigated is Bowman layer transplantation.
The Bowman layer is a thin acellular layer situated between the corneal epithelium and stroma.
In selected advanced keratoconus cases, transplantation of donor Bowman layer tissue has been investigated as a method of mechanically reinforcing and flattening the ectatic cornea.
The technique is particularly interesting because it may offer a way of delaying conventional keratoplasty in selected advanced cases.
Stromal Lenticule Addition Keratoplasty
Another emerging concept is stromal lenticule addition keratoplasty.
The basic principle is to introduce biological stromal tissue within the cornea to modify its shape and potentially influence its structural properties.
Research into stromal addition procedures forms part of a broader movement toward corneal-sparing surgery.
Recent reviews have discussed Bowman layer transplantation, CAIRS and stromal lenticule addition techniques as part of this emerging field.
Could Tissue Addition Replace Corneal Transplantation?
Possibly for some patients in the future—but it is too early to make that claim universally.
A more realistic possibility is that tissue-addition procedures may eventually become another treatment stage between conventional optical rehabilitation, cross-linking and transplantation.
Moderate disease → CXL → specialty lenses → selected tissue-addition procedure → DALK → PK when necessary.
The actual pathway will depend entirely on the patient's anatomy and clinical circumstances.
Customized Corneal Cross-Linking
Standardized CXL protocols are increasingly being complemented by research into customized treatment.
The basic idea is straightforward: not every keratoconic cornea has the same shape or weakness, so perhaps treatment should not always be identical.
Researchers are investigating treatment approaches that consider:
- Corneal thickness
- Corneal curvature
- Location of the cone
- Topographic pattern
- Biomechanical characteristics
Customized cross-linking remains an active research area, and individual protocols should not automatically be considered standard treatment simply because they are newer.
Cross-Linking in Very Thin Corneas
Very thin corneas present a particular challenge.
Adequate corneal thickness is important because excessive ultraviolet exposure to deeper ocular structures can potentially damage the corneal endothelium.
Researchers are therefore investigating modified protocols for thinner corneas.
Some approaches involve individualized irradiation strategies or modified riboflavin protocols.
A newer or modified CXL protocol is not automatically safer or more effective. Very thin corneas require careful evaluation by an experienced corneal specialist.
Artificial and Regenerative Corneas: Could Donor Corneas Eventually Become Unnecessary?
Researchers are investigating alternatives to conventional donor tissue, including artificial corneal devices, tissue-engineered corneas, biological scaffolds, regenerative medicine and cell-based approaches.
The long-term objective is ambitious: to create or regenerate corneal tissue capable of restoring transparency, strength and optical function without depending entirely on donor tissue.
However, these technologies are at different stages of research and development. A promising laboratory discovery does not automatically become an available clinical treatment.
The cornea must satisfy demanding requirements including:
- Optical transparency
- Mechanical strength
- Correct curvature
- Biological compatibility
- Resistance to infection
- Appropriate hydration
- Long-term stability
Artificial Corneas and Keratoprosthesis
For selected patients who cannot achieve a successful conventional corneal transplant, artificial corneal devices known as keratoprostheses may sometimes be considered.
These devices are fundamentally different from DALK or PK because they use a prosthetic optical component rather than simply replacing the diseased cornea with ordinary donor tissue.
Keratoprosthesis procedures are generally reserved for highly selected complex cases and are not routine treatment for ordinary keratoconus.
Artificial Intelligence and Earlier Keratoconus Detection
Artificial intelligence is another rapidly developing area of corneal research.
Modern corneal tomography produces enormous amounts of information about:
- Anterior corneal shape
- Posterior corneal shape
- Thickness distribution
- Elevation
- Curvature
- Asymmetry
- Biomechanical characteristics
Machine-learning systems can analyze complex patterns that may be difficult to identify using conventional measurements alone.
Earlier identification of subtle keratoconus could create a larger window for monitoring and stabilization before severe structural damage develops. This could ultimately reduce the number of patients who progress to advanced corneal disease.
Why Early Diagnosis Matters So Much
Consider two hypothetical patients.
Patient A: Early detection
Keratoconus is detected early. The patient undergoes regular tomography. Progression is identified and appropriate stabilization treatment is performed. The cornea remains structurally stable and the patient continues with glasses or specialty contact lenses.
Patient B: Late detection
Keratoconus remains undiagnosed for years. The cornea progressively steepens. Contact-lens fitting becomes increasingly difficult. Severe irregularity and possibly scarring develop. Eventually, transplantation may become necessary.
This does not mean every transplant can be prevented. Some patients are diagnosed late, some progress despite treatment and some present with severe disease from the beginning.
The Importance of Avoiding Eye Rubbing
Eye rubbing has an important association with keratoconus.
Repeated mechanical stress may contribute to corneal biomechanical damage. Patients with allergic eye disease or chronic ocular itching may therefore benefit from appropriate management of the underlying eye irritation.
Avoiding eye rubbing cannot reverse established keratoconus, but minimizing mechanical stress is an important part of responsible long-term eye care.
Keratoconus in Children and Teenagers
Keratoconus in younger patients deserves particular attention because disease progression can sometimes be more aggressive.
Children and teenagers may initially interpret changes in vision as an ordinary need for stronger glasses.
Corneal tomography can be particularly useful when keratoconus is suspected. Early identification provides an opportunity to monitor progression and consider stabilization before severe structural damage develops.
Can Corneal Transplantation Improve Vision to 20/20?
It can produce major visual improvement, but 20/20 vision cannot be guaranteed.
The final result depends on:
- Quality of donor tissue
- Surgical technique
- Corneal healing
- Residual astigmatism
- Graft clarity
- Ocular-surface condition
- Retinal and optic-nerve health
- Postoperative complications
- Refractive correction
Good vision also involves contrast, glare, distortion, night vision and overall functional visual quality—not merely one visual-acuity number.
Can You Wear Contact Lenses After a Corneal Transplant?
Yes.
Some patients eventually benefit from rigid gas-permeable or scleral lenses because a transplanted cornea may still have residual astigmatism or irregularity.
The fitting process should be performed carefully by an experienced eye-care professional.
Needing a contact lens after transplantation does not necessarily indicate that the transplant failed.
How Successful Is Corneal Transplantation for Keratoconus?
Keratoconus is generally regarded as a relatively favorable indication for corneal transplantation, particularly because many affected patients have otherwise healthy eyes.
The prognosis depends on the surgical technique and individual anatomy.
For suitable patients, DALK offers the major advantage of retaining healthy native endothelial cells.
PK has a long history of successful use and remains an important procedure when DALK is unsuitable.
A published graft-survival percentage represents a population average, not a guarantee for an individual patient. Personal prognosis depends on disease severity, eye health, surgical factors, postoperative care and other variables.
What Happens if a Corneal Transplant Is Rejected?
A rejection episode does not automatically mean that the transplant has permanently failed.
If detected early and treated appropriately, a graft may recover. Treatment commonly involves corticosteroid therapy under ophthalmological supervision, with treatment intensity depending on the type and severity of rejection.
Do not simply start using leftover steroid eye drops without medical advice. Steroids can increase intraocular pressure and may worsen certain infections. Suspected graft rejection requires professional examination.
How Can You Reduce the Risk of Graft Problems?
- Attend scheduled follow-up examinations.
- Use prescribed medications exactly as directed.
- Avoid rubbing the eye.
- Protect the eye from trauma.
- Report sudden visual deterioration.
- Report significant redness or pain.
- Report increased light sensitivity.
- Do not stop prescribed steroid treatment without medical advice.
- Maintain good ocular-surface health.
- Seek prompt treatment for suspected infection or inflammation.
Is Corneal Transplantation Permanent?
A successful corneal graft can function for many years and potentially decades. However, no transplant can be guaranteed to last forever.
Grafts can eventually develop:
- Endothelial cell loss
- Graft failure
- Rejection
- Chronic inflammation
- Infection
- Structural complications
Fortunately, modern corneal transplantation has improved considerably and a healthy, uncomplicated graft can provide long-term visual rehabilitation.
The Future of Corneal Transplantation
The future of keratoconus treatment is unlikely to consist of one single revolutionary procedure.
Instead, treatment is likely to become increasingly personalized.
Future corneal assessment may potentially determine:
- Where the cornea is structurally weakest
- How rapidly it is changing
- Which regions require strengthening
- How much tissue is needed for reshaping
- Which CXL pattern is most appropriate
- Whether ring segments may help
- Whether biological tissue addition is appropriate
- Whether transplantation can safely be postponed
Modern corneal research increasingly considers stabilization, reshaping, tissue addition and tissue replacement as different levels of intervention rather than assuming that transplantation is the inevitable final step.
A New Way to Think About Keratoconus Treatment
| Traditional approach | Modern/emerging approach |
|---|---|
| Correct the vision | Detect the disease early |
| Treat progression | Measure progression precisely |
| Transplant when necessary | Stabilize biomechanics early |
| Replace diseased tissue | Preserve native tissue whenever possible |
| Focus primarily on visual acuity | Focus on visual quality and corneal structure |
DALK, PK, CXL and CAIRS: A Simple Comparison
| Treatment | Main purpose | Typical role |
|---|---|---|
| 👓 Spectacles | Correct refractive error | Early keratoconus |
| 🔍 Specialty contact lenses | Improve optical quality | Mild to advanced disease |
| 🧬 CXL | Stabilize progressive cornea | Progressive keratoconus |
| ⭕ Intracorneal ring segments | Reshape cornea | Selected cases |
| 🧫 CAIRS | Biological reshaping/reinforcement | Emerging option for selected cases |
| 🧬 Bowman layer transplantation | Structural reinforcement | Selected advanced disease |
| 🔬 DALK | Replace diseased anterior/stromal cornea | Advanced keratoconus |
| 👁 PK | Replace full-thickness cornea | Severe/scarred/unsuitable cases |
Frequently Asked Questions About Corneal Transplant for Keratoconus
Final Takeaway
Keratoconus can be frightening, especially when the words “corneal transplant” enter the conversation.
But a diagnosis of keratoconus does not mean that transplantation is inevitable. Modern management has changed dramatically.
Early detection through corneal topography and tomography can identify structural abnormalities before severe visual disability develops. Specialty contact lenses can provide optical rehabilitation. Corneal cross-linking can stabilize progressive disease in appropriately selected patients.
For advanced disease, modern surgeons can choose between selective tissue replacement such as DALK and full-thickness transplantation such as PK.
At the same time, a new generation of treatments is emerging—including CAIRS, Bowman layer transplantation, stromal tissue addition, customized cross-linking and other corneal-sparing approaches.
Scientific References and Further Reading
- Gomes J.A.P. et al. Global Consensus on Keratoconus and Ectatic Diseases — Edition 2. 2026.
- Evidence-Based Clinical Practice Guideline for Diagnosis, Treatment, and Follow-Up of Keratoconus Patients. 2026.
- American Academy of Ophthalmology EyeWiki. Keratoconus.
- American Academy of Ophthalmology EyeWiki. Deep Anterior Lamellar Keratoplasty (DALK).
- American Academy of Ophthalmology EyeWiki. Corneal Allograft Rejection and Failure.
- U.S. Food and Drug Administration. Epioxa/Epioxa HD prescribing information and approval information.
- Recent reviews and clinical studies concerning Corneal Allogeneic Intrastromal Ring Segments (CAIRS), including customized and custom-shaped approaches.
- Recent literature concerning Corneal Tissue Addition Keratoplasty for keratoconus.
- Recent reviews concerning Bowman layer transplantation, stromal lenticule addition and other corneal-sparing procedures.
- Recent research concerning conventional, accelerated, epithelium-on and thin-cornea corneal cross-linking.
This article is intended for educational and informational purposes only. It does not constitute medical advice, diagnosis or a recommendation for any specific treatment.
Keratoconus and corneal transplantation require individualized assessment by a qualified ophthalmologist or corneal specialist. Treatment decisions should be based on clinical examination, corneal topography/tomography, pachymetry, visual function, disease progression and other patient-specific factors.
If you experience sudden vision loss, severe eye pain, marked redness, increased sensitivity to light or other significant changes—particularly after corneal transplantation—seek urgent medical attention.
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