Short answer
Corneal cross-linking (CXL) strengthens corneal collagen to halt keratoconus progression. Riboflavin (vitamin B2) drops soak the cornea, then controlled UV-A light activates cross-links between collagen fibres — stiffening the cornea and slowing or stopping further bulging. CXL is the first-line treatment for progressing KC — not a vision correction procedure. Vision may fluctuate during healing; stability is the goal before planning ICL.
How does cross-linking work?
Riboflavin acts as a photosensitiser. UV-A activates it to form new bonds between collagen strands — increasing corneal biomechanical strength and resistance to further ectasia.
- 1Epithelium removed (epi-off) or left intact (epi-on) depending on protocol.
- 2Riboflavin drops applied for 20–30 minutes.
- 3UV-A light delivered for a set duration (standard or accelerated).
- 4Bandage contact lens worn during initial healing.
What to expect after CXL
Discomfort and blurred vision for days to weeks — normal during healing. Prescription may shift temporarily. Serial topography at 3, 6, and 12 months confirms stability before ICL planning.
CXL does not reverse existing corneal shape — it prevents further progression. Glasses or scleral lenses manage vision during and after healing.
Who needs cross-linking?
- Documented KC progression on serial topography
- Age under ~40 with active disease
- Rapid prescription change
- Stable maps over 12+ months
- Older patients with long-standing stable KC
- Very advanced KC — transplant pathway may apply
What comes after CXL?
Once stable 12+ months: toric ICL for lens-free correction, or continued scleral/RGP lenses. LASIK and SMILE remain contraindicated.
Read: Can ICL help keratoconus? · Keratoconus treatment options · Keratoconus guide.
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