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Corneal cross-linking
Category: Eye Procedures & Tests · All eye procedures & tests
What it is
Corneal cross-linking strengthens a weak, bulging cornea (keratoconus) using riboflavin (vitamin B2) eye drops activated by ultraviolet light, which stiffens the corneal tissue and usually halts progression.
Why it is done
It is offered for progressive keratoconus — where the cornea is documented to be steepening or thinning over time — mainly in younger patients whose condition is still changing.
How to prepare
Progression is confirmed with corneal scans over months. Contact lenses must be left out for a period before measurements and treatment, as instructed. Tell the team about eye conditions, allergies and pregnancy (treatment is usually deferred).
What happens during the procedure
The surface layer of the cornea is usually removed (epi-off technique), riboflavin drops are applied for about half an hour, then UV light for a set period while more drops are given. A soft bandage contact lens is placed at the end. Treatment takes about an hour per eye; usually one eye is treated at a time.
Afterwards — recovery & results
The eye is painful and light-sensitive for a few days as the surface heals; you will have drops and painkillers, and time off work or study is commonly a few days to a week. Vision fluctuates for weeks to months before stabilising. Follow-up scans confirm whether progression has stopped.
Risks & considerations
Risks include infection, delayed surface healing, corneal haze (usually mild and fading), and rarely continued progression or effects on vision. Success in halting progression is high but vision itself is not usually improved by the treatment — glasses or lenses are still needed.
Watch: Corneal cross-linking videos
Real procedure videos from the MedicalVideos.com library. Some clinical footage is graphic — that is the nature of a medical video library.
Frequently asked questions
Will it give me normal vision?
The goal is to stop the cornea weakening further, preserving the vision you have. Any improvement is a bonus; most people still use glasses or contact lenses.
Why treat if my vision is okay now?
Keratoconus progresses fastest in teens and twenties and can lead to severe distortion needing corneal transplant. Early cross-linking prevents that trajectory in most cases.
Related procedures — Eye Procedures & Tests
Browse the C section of the A–Z list or return to the Procedures & Tests hub.