Corneal cross-linking (CXL)
Corneal cross-linking is a treatment used to strengthen the cornea and reduce the risk of keratoconus or corneal ectasia becoming worse.
The main goal is stability, not an instant improvement in sight. Vision may change gradually after healing, and many people still need glasses or contact lenses for best vision.
Why might CXL be recommended?
In keratoconus, the cornea can become thinner and more irregular over time. CXL creates additional links between collagen fibres within the cornea, helping it become more stable. Your ophthalmologist recommends it when the examination and repeat corneal scans suggest that progression is occurring, or when the individual risk of progression is high.
What happens during the procedure?
CXL is usually performed with numbing eye drops while you are awake. You should not feel pain during the procedure, although your eye may feel uncomfortable afterwards. The exact plan can vary, so your treating team will explain the protocol that applies to you.
Numbing dropsAnaesthetic drops are used to make the eye comfortable for treatment.
Surface preparationIn the standard epithelium-off approach, a small central area of the thin outer layer of the cornea is gently removed.
Riboflavin dropsVitamin B2 (riboflavin) drops are applied repeatedly so that they soak into the cornea.
UVA treatmentThe cornea is exposed to carefully controlled ultraviolet-A light while riboflavin drops continue.
Protection and dropsThe eye is cleaned, antibiotic drops are given, and your team will provide the aftercare plan.
What to expect after CXL
For the first few days, it is common to have pain or discomfort, watering, light sensitivity, a gritty or foreign-body sensation, and blurred vision. The surface of the cornea commonly heals over several days, but visual recovery can take longer and differs from person to person.
Use medicines as prescribed
Use your drops exactly as directed. Do not add, stop or share eye drops without asking your treating team.
Protect the eye
Avoid rubbing the eye. Keep it clean and dry, and follow any instructions about bathing, swimming, makeup, a bandage lens or an eye shield.
Keep review appointments
Follow-up visits allow the team to check healing, monitor the cornea and arrange scans when appropriate.
Benefits and possible risks
The intended benefit of CXL is to slow or halt progression and protect vision over the long term. It does not promise sharper vision or eliminate the possible need for glasses, contact lenses or other treatment.
As with any corneal procedure, complications can occur. These may include temporary pain, delayed surface healing, temporary corneal haze, infection, scarring, a temporary reduction in vision, or continued progression despite treatment. Your ophthalmologist will discuss your individual risks and alternatives before treatment.
When to contact us urgently
Contact your eye-care team promptly if you have severe or increasing pain, increasing redness, worsening vision, new discharge, or any concern that the eye is not improving as expected. Do not wait for a planned follow-up visit.
This page adapts the clinic's supplied CXL patient-information leaflet for web use. It is general education and does not replace the personalised instructions provided by your ophthalmologist.