---
title: "Corneal cross-linking | Eye Health Guide"
description: "How corneal cross-linking strengthens the cornea to halt keratoconus, what happens during the procedure, and what to expect in recovery."
url: https://eyehealthguide.org/treatments/corneal-cross-linking/
source: Eye Health Guide
licence: "General information only. Cite the URL and the named medical reviewer."
---

Treatment

# Corneal cross-linking

Medical reviewer [Mr Mohamed Mohyudin](https://eyehealthguide.org/reviewers/mohamed-mohyudin/)· Last recorded site review July 6, 2026

### About this review

This page inherits the site’s previous review record. A separate, current article sign-off has not yet been recorded.

[How review works](https://eyehealthguide.org/reviewers/) · [Official biography & credentials](https://mohamedmohyudin.co.uk/author/mohamed-mohyudin/)

Quick answer

Corneal cross-linking is a procedure that strengthens the cornea to slow or stop keratoconus from progressing. It uses vitamin B2 (riboflavin) drops and ultraviolet light to create new bonds in the cornea. It aims to halt worsening rather than improve vision, and works best when started early.

### On this page ⌄

1. What it is
2. What happens
3. Recovery
4. What to expect
5. Conditions this can help
6. Frequently asked questions

## What it is

Corneal cross-linking strengthens the cornea in keratoconus, where the cornea thins and bulges. By adding new cross-links between the fibres of the cornea, it makes it stiffer and more stable, which helps stop the cone shape from getting worse over time.

## What happens

It is usually a day procedure done with numbing drops.

- Numbing drops so the eye does not feel pain
- Riboflavin (vitamin B2) drops applied to the cornea
- A controlled dose of ultraviolet (UV) light to activate the bonds
- A protective contact lens placed on the eye afterwards

## Recovery

The eye is often sore, watery and sensitive to light for a few days while the surface heals. You will use drops and usually wear a protective lens for a short time. Vision can be blurry at first and settles over the following weeks.

## What to expect

The main goal is to stop keratoconus from progressing, protecting your future vision, rather than to improve your current sight. Most people still need glasses or contact lenses afterwards. Starting early, while keratoconus is still progressing, gives the best chance of preserving vision.

## Conditions this can help

## Frequently asked questions

### Does corneal cross-linking improve vision?

Its main aim is to stop keratoconus getting worse rather than to improve vision. Most people still need glasses or contact lenses afterwards, but their cornea is more stable.

### Is corneal cross-linking painful?

The eye is numbed during the procedure, so it is not usually painful at the time. The eye can be sore, watery and light-sensitive for a few days afterwards while it heals.

### Who is corneal cross-linking for?

It is mainly for people with keratoconus that is still progressing, especially younger people, where strengthening the cornea early can help preserve future vision.

Your next step

## Take this to your appointment

Write down what has changed, when it started, your current medicines and the questions you want answered. Take these to your eye-care appointment.

Sudden loss of sight, severe eye pain or a dark curtain across vision needs immediate assessment. Do not wait to complete a worksheet.

## Sources for this information

These references support the information on this page. Follow the linked source for its full context.

- [Moorfields Eye Hospital - Corneal cross-linking (PDF)](https://www.moorfields.nhs.uk/mediaLocal/gfgnybmp/corneal-cross-linking.pdf)