Corneal cross-linking strengthens a weak, bulging cornea by soaking it with riboflavin (vitamin B2) drops and exposing it to controlled ultraviolet A light. This creates new chemical bonds between collagen fibres.
It is the only treatment shown to stop keratoconus from progressing in most eyes. It is not a vision correction procedure: you will usually still need glasses or contact lenses afterwards.
What Corneal Cross-Linking (CXL) involves
After anaesthetic drops, the surgeon removes the thin surface layer (epithelium) from the central 8 to 9 mm of the cornea so that riboflavin can penetrate. Riboflavin drops are applied every few minutes for 10 to 30 minutes, and corneal thickness is checked with ultrasound; at least 400 microns is needed to protect the inner cell layer. The eye is then exposed to UVA light for 30 minutes at 3 mW per square centimetre in the original Dresden protocol, or 5 to 10 minutes at higher intensity in accelerated protocols. A bandage contact lens is placed and antibiotic drops are started.
Who is a good candidate for Corneal Cross-Linking (CXL)?
It is for corneas that are documented to be getting worse, while they are still thick and clear enough.
- Keratoconus with progression shown on serial topography
- Children and teenagers with keratoconus, in whom it advances fastest
- Pellucid marginal degeneration
- Corneal ectasia after LASIK or other laser surgery
- Eyes with a minimum corneal thickness of about 400 microns
It is usually not the right choice if:
- Stable keratoconus in an older adult, which can simply be observed
- Corneas that are too thin or have central scarring, which may need a transplant
- Previous herpes eye infection, because UV light can reactivate it
- Active eye infection or severe dry eye
- Pregnancy and breastfeeding, when treatment is usually delayed
Technique options
- Epithelium-off, Dresden protocol: The original method with the longest follow-up and most evidence.
- Accelerated epi-off: Higher intensity for a shorter time; results appear similar and it is now widely used.
- Epithelium-on (transepithelial): More comfortable with faster healing, but generally less effective at halting progression.
- Cross-linking with topography-guided laser: Adds a limited surface laser to regularise shape in selected eyes; more tissue is removed, so selection is strict.
- Hypo-osmolar riboflavin: Swells a thin cornea temporarily so that it can be treated safely.
What happens during your treatment
You lie on a couch with a lid holder in place for 30 to 60 minutes. You feel no pain during treatment and simply look at a light. One eye is normally treated at a time, with the second a few weeks later.
Preparing for your trip
Plan about a week in the city for one eye: assessment with topography on day one, treatment on day two, and checks until the surface has healed and the bandage lens is removed at around day 4 to 5. The second eye needs another visit. Follow-up scans at 3, 6 and 12 months can be done at home if your ophthalmologist has a corneal tomographer.
- Tell the doctor about medication, allergies, pregnancy or breastfeeding, and any history of cold sores, keloid scars or autoimmune disease
- Avoid alcohol, aspirin and anti-inflammatory painkillers for a few days beforehand if your own doctor agrees, to reduce bruising
- Arrive without make-up on the treatment area and avoid sunbeds and strong sun for two weeks before
Recovery and results
The first 2 to 3 days are painful, with watering and light sensitivity, until the surface heals. Vision is hazy for several weeks and often a little worse than before for 1 to 3 months. Do not rub your eyes. Contact lenses can usually be resumed after about a month, and they may need refitting as the cornea changes shape slowly over a year.
- Back to everyday activity: About 1 week off work
- When results show: Stabilisation confirmed over 6 to 12 months
- How long they last: Long-lasting in most; 10-year data show stability
Safety, risks and revision policy
Complications are uncommon, but the first week needs proper supervision.
- Corneal infection while the surface is healing
- Haze that usually fades but occasionally persists
- Delayed surface healing
- Sterile inflammatory spots in the cornea
- Continued progression in roughly 5 to 10 in 100 eyes, which may need repeat treatment
- Loss of a line or more of corrected vision in a small minority
Every written proposal arranged through Clinic-Y states what the clinic covers if a correction is needed. Ask for it before you book, not after.
Cost of Corneal Cross-Linking (CXL) in Türkiye
Clinic-Y does not publish a single price for Corneal Cross-Linking (CXL), because the honest figure depends on your case. What moves it:
- One eye or both, and whether they are treated on separate trips
- Protocol used and any combined laser or ring implantation
- Number of follow-up visits and scans included
- Specialist contact lens fitting afterwards
Send your photographs or reports and you receive written, all-inclusive proposals from suitable teams, side by side. Reviewing your case is free.
Frequently Asked Questions
Will I see better afterwards?
The aim is to stop things getting worse. Some people gain a little flattening and clarity over a year, but this cannot be promised.
Is there an age limit?
No. Young patients benefit most because their disease moves fastest. Over the age of about 40 keratoconus often stabilises by itself.
Can I have laser eye surgery afterwards?
Standard LASIK remains unsuitable for keratoconus. Options such as implantable lenses or specialist contact lenses are discussed once the cornea is stable.