Keratoconus Treatment: Corneal Cross Linking
Corneal cross-linking is an established treatment used to slow or halt progression of keratoconus in suitable patients. The procedure uses riboflavin and controlled ultraviolet-A light to strengthen the cornea. Learn who may benefit, what recovery involves, possible risks, Medicare eligibility and how cross-linking differs from CAIRS.
What is corneal cross-linking?
Keratoconus causes the cornea to become thinner and progressively change shape. As the cornea becomes more irregular, vision can become blurred or distorted and glasses prescriptions may change more frequently.
Cross-linking is designed to increase the biomechanical stability of the cornea. Its main purpose is to reduce the risk of further progression - not to remove keratoconus or guarantee that glasses or contact lenses will no longer be needed.
Who needs corneal cross-linking?
Not every person with keratoconus needs cross-linking. RANZCO recommends treatment when there is clear evidence that the condition is progressing, based on changes in refraction, corneal topography or tomography and other clinical findings.
Younger patients may require closer monitoring because keratoconus can progress more rapidly during adolescence and early adulthood.
How is progression assessed?
Your assessment may include:
- Changes in your glasses or contact-lens prescription
- Corneal topography or tomography
- Maximum and regional corneal curvature measurements
- Corneal thickness measurements
- Posterior corneal elevation and other tomographic progression markers
- Changes in corrected vision or contact-lens fit
Progression is assessed over time whenever clinically appropriate. In younger patients or eyes considered at high risk, your ophthalmologist may recommend treatment based on a broader pattern of clinical risk.
How does corneal cross-linking work?
Cross-linking uses riboflavin (vitamin B2) together with controlled ultraviolet-A light. The interaction creates additional chemical bonds within the corneal collagen structure, increasing corneal stiffness and resistance to further deformation.
Different cross-linking protocols are available. The exact steps, UVA intensity and exposure time depend on the protocol selected for your cornea.
What happens during cross-linking?
1. Anaesthetic eye drops
Local anaesthetic drops are used to numb the surface of the eye.
2. Preparation of the cornea
In standard epithelium-off cross-linking, the thin surface layer of the cornea is removed so riboflavin can penetrate the corneal tissue. Selected alternative protocols may preserve the epithelium.
3. Riboflavin treatment
Riboflavin drops are applied to the cornea according to the treatment protocol.
4. Controlled UVA exposure
The cornea is exposed to a carefully controlled ultraviolet-A light treatment. Corneal thickness and other safety factors are assessed before and during treatment as required.
5. Bandage contact lens
After epithelium-off treatment, a soft bandage contact lens is commonly placed over the eye while the surface heals.
How long does cross-linking take?
Treatment time depends on the cross-linking protocol. Traditional protocols can take longer, while accelerated protocols use different UVA settings to shorten the exposure period.
Your clinic will explain how long to allow for preparation, treatment and postoperative checks.
What is recovery like?
Recovery depends on the protocol used. After epithelium-off cross-linking, discomfort, watering, light sensitivity and blurred vision are common while the corneal surface heals.
A bandage contact lens is usually worn for several days. Vision can fluctuate during the early healing period and may take weeks or longer to settle.
During the first few days
- Use postoperative eye drops exactly as directed.
- Do not rub the treated eye.
- Wear the protective shield if instructed.
- Avoid swimming and environments that increase infection risk until advised.
- Contact the clinic urgently for increasing pain, worsening redness, discharge or a sudden reduction in vision.
Contact lenses after cross-linking
Many patients still need glasses or contact lenses after cross-linking because the treatment is primarily intended to stabilise the cornea rather than fully correct the irregular prescription.
Contact-lens wear is usually restarted only after the corneal surface has healed and your treating team confirms it is appropriate. A refit may be required if the corneal shape changes.
Benefits of cross-linking
For suitable patients with progressive keratoconus, potential benefits include:
- Reducing the risk of further corneal steepening or distortion
- Improving long-term corneal stability
- Helping preserve existing visual function
- Reducing the likelihood that progression leads to more advanced keratoconus
- Potentially delaying or reducing the need for corneal transplantation in some patients
Some patients experience modest corneal flattening or improvement in vision after treatment, but this is variable and should not be considered the primary goal.
Is cross-linking safe?
Corneal cross-linking is a well-established treatment, but no procedure is risk-free. Careful patient selection, corneal-thickness assessment and adherence to the chosen treatment protocol are important.
Possible side effects and complications can include:
- Pain, grittiness or light sensitivity during early healing
- Temporary blurred or fluctuating vision
- Corneal haze
- Delayed healing of the corneal surface
- Infection or sterile inflammation
- Corneal scarring
- Rare damage to deeper corneal structures
- Continued keratoconus progression despite treatment
- The possible need for repeat treatment or other keratoconus procedures
Is cross-linking a cure for keratoconus?
No. Cross-linking does not remove keratoconus or restore the cornea to a normal shape. It is used to make the cornea more resistant to further deformation.
You may still need glasses, specialised contact lenses or another procedure to improve visual quality after the keratoconus has been stabilised.
How long does cross-linking last?
Long-term studies show that many treated eyes remain stable for years after cross-linking. However, no procedure can guarantee lifetime stability.
Regular follow-up remains important because a small proportion of patients can continue to progress or may require further treatment.
Cross-linking cost and Medicare in Australia
Medicare may provide a rebate for corneal collagen cross-linking when the eligibility criteria for MBS item 42652 are met. The item applies to a patient with a corneal ectatic disorder and evidence of progression.
Your final out-of-pocket cost depends on the surgeon, clinic or day-surgery fees, the treatment setting and whether you meet Medicare or private-health-fund requirements.
Ask the clinic for a written quote and confirmation of the relevant Medicare item before treatment.
What is CAIRS?
CAIRS stands for Corneal Allogenic Intrastromal Ring Segments. Carefully shaped segments of donor corneal tissue are placed within channels in the cornea to regularise corneal shape and potentially improve visual quality in selected patients.
Current evidence is encouraging, but patient selection, segment design and treatment planning continue to evolve.
Cross-linking vs CAIRS
Cross-linking and CAIRS have different primary goals: cross-linking is primarily used to stabilise progressive keratoconus, while CAIRS is primarily a corneal-reshaping strategy intended to improve corneal regularity and optical performance.
Selected patients may be considered for both approaches. The sequence and suitability are determined individually.
Cross Linking vs CAIRS: Which Is Right for You?
| Cross Linking | CAIRS |
|---|---|
| Strengthens the cornea | Reshapes and stabilises the cornea |
| Stops progression | Improves vision and corneal shape |
| One-time, non-invasive | Requires minor surgical implantation |
| Often used early | Ideal for moderate to advanced cases |
| Lower cost | Typically more expensive |
Can I have LASIK if I have keratoconus?
Routine LASIK is generally not recommended for keratoconus because it removes corneal tissue and can further weaken an already ectatic cornea.
In highly selected cases, specialist corneal surgeons may consider other surface-laser or topography-guided strategies after or in combination with cross-linking. These are individualised treatments and are not the same as routine LASIK.
What else can help keratoconus vision?
Treatment depends on the stage of keratoconus and whether it is progressing. Other options may include:
- Glasses for mild refractive error
- Specialised soft, rigid gas-permeable, hybrid or scleral contact lenses
- CAIRS in selected patients
- Corneal cross-linking for documented progression
- Corneal transplantation for advanced disease when other options cannot provide adequate vision or structural stability
Avoid eye rubbing
Chronic vigorous eye rubbing is associated with keratoconus and may contribute to progression. If allergies or itchy eyes are making you rub your eyes, ask your eye-care professional about treating the underlying irritation.
When should I see a keratoconus specialist?
Arrange review if you have been diagnosed with keratoconus, your glasses prescription is changing quickly, contact lenses are becoming harder to fit, or corneal scans show progression.
Regular monitoring is particularly important for children, teenagers and young adults because progression can occur more rapidly in younger patients.
Book a keratoconus assessment
A keratoconus assessment can determine whether your cornea is stable or progressing and whether cross-linking, CAIRS, specialised contact lenses or another treatment should be considered.
Book an assessment with personalEYES or call 1300 68 3937.
Everything under one roof.
Common questions.
Ready for clearer vision?
Book a free assessment with our specialists - in under 2 minutes.