CTAK (Corneal Tissue Addition Keratoplasty) is a modern technique in which ring segments made of processed human corneal tissue are implanted within the corneal layers, instead of synthetic plastic rings. The ring flattens the cone and restores a more regular corneal surface, improving vision and reducing astigmatism, and making glasses or contact lenses easier to wear. Being natural tissue, it is more compatible with the cornea and less prone to the complications of synthetic rings.
Signs & who it is for
- Stable or cross-linked keratoconus with poor vision in glasses
- Intolerance of specialty contact lenses
- A clear cornea without central scarring
- A wish to delay or avoid corneal transplantation
When is it recommended?
Once the cornea is stable (naturally or after cross-linking) when vision in glasses remains unsatisfactory and specialty lenses are not tolerated. Each patient is assessed by imaging to plan the ring's size and position precisely.
Options & techniques
- Planning the ring's position and size from the corneal map
- Creating the intracorneal tunnel with femtosecond laser and implanting the ring
- A short procedure under anaesthetic drops with recovery in days
- Can be combined with cross-linking in the same session or afterwards
Frequently asked questions
How does CTAK differ from synthetic rings?
Synthetic rings are plastic; CTAK is natural corneal tissue, so it is more compatible with the eye and can be used even in thin corneas unsuitable for synthetic rings.
Book your appointment in Riyadh
Dr. Sulaiman Al Habib Specialist Hospital – Riyadh · By appointment — call or WhatsApp for the next available slot