Bowman layer transplant is a cone-flattening procedure for advanced keratoconus. A thin, acellular donor Bowman layer is placed into the cornea — either inside a mid-stromal pocket or as a surface onlay — to flatten and stabilise a cone that is too steep or too thin for cross-linking. It halts progression and improves contact-lens comfort while keeping the recipient cornea largely intact.
What is Bowman layer transplant?
In advanced keratoconus the cornea can become too steep or too thin for corneal cross-linking, yet there may be no central scarring that would require a full transplant. BLT fills exactly this gap. Because the transplanted Bowman layer is acellular, classical immune rejection of the type seen with DALK or penetrating keratoplasty is not described, and there is no suture-related astigmatism across the visual axis. BLT does not replace the irregular cornea with a normal one — most patients still need a rigid gas-permeable or scleral lens for their best vision — but it stabilises the eye and preserves future surgical options.
It is performed by consultant cornea and ectasia surgeons at our South England partner clinics, with UK-wide guidance through your pathway. A key strategic advantage is that BLT does not preclude a later DALK if the cone progresses or scarring develops.
Where BLT fits in the keratoconus pathway
How Bowman layer transplant is performed
BLT is a day-case procedure. In the mid-stromal pocket technique, the surgeon creates a precise pocket within the cornea, gently unfolds the thin donor Bowman layer inside it, and closes the small entry tunnel with a single suture (removed at a later visit) — with no sutures across the visual axis. In the onlay technique the Bowman layer is placed on the surface beneath the epithelium, supported by a bandage contact lens while the surface heals. Either way the recipient’s own corneal architecture is largely preserved and the cone flattens as the graft integrates.
Keratoconus too advanced for cross-linking but no central scarring yet? BLT may be the right step.
Book your corneal assessmentRecovery timeline
Week 1–2
Most patients return to non-strenuous office work within one to two weeks. A topical corticosteroid taper controls inflammation; an onlay graft is supported by a bandage contact lens while the surface heals.
Weeks 4–6
Strenuous exercise, swimming and contact sports are avoided for around four to six weeks. The cornea is flattening and beginning to stabilise.
~3 months
Once the cornea has stabilised, RGP, hybrid or scleral lens refitting is started — many patients find the lens fits more comfortably than before because the cone is less steep.
Ongoing
Eye-rubbing must be controlled for life to preserve the result. A structured 12-month follow-up tracks corneal stability, and a later DALK remains possible if needed.
How much does Bowman layer transplant cost?
UK 2026 self-pay Bowman layer transplant is typically £6,500–£9,500 per eye, inclusive of the consultant cornea assessment, full corneal imaging, donor Bowman layer graft preparation from an accredited UK or European eye bank, anaesthetic and theatre fees, the procedure itself and a structured 12-month follow-up programme. RGP or scleral lens refitting after the cornea stabilises is usually a separate cost. We quote your full pathway in writing before surgery — see our price list.
Bowman layer transplant FAQs
How much does private Bowman layer transplant cost in the UK in 2026?
Self-pay Bowman layer transplant in the UK in 2026 is typically £6,500–£9,500 per eye, inclusive of consultant cornea assessment, full corneal imaging, donor Bowman layer graft preparation from an accredited UK or European eye bank, anaesthetic and theatre fees, the procedure itself and a structured 12-month follow-up programme.
Will Bowman layer transplant cure my keratoconus?
No. BLT halts progression and flattens the cone, preserving contact-lens tolerance and the option of a later DALK. It does not replace the irregular ectatic cornea with a normal cornea. Most patients still need an RGP or scleral contact lens for their best corrected vision after BLT.
How does Bowman layer transplant compare with cross-linking?
Corneal cross-linking is the first surgical step in the keratoconus ladder, used to halt progression in eyes with adequate corneal thickness. BLT is reserved for advanced disease that is too steep or too thin for cross-linking, or eyes that have continued to progress despite cross-linking.
How does BLT compare with DALK?
DALK replaces the recipient corneal stroma with donor stroma down to Descemet’s membrane and is the right operation when there is significant central corneal scarring or established contact-lens intolerance. BLT preserves the recipient’s anterior corneal architecture, has no suture-related astigmatism across the visual axis, no immune rejection risk and a shorter rehabilitation, but does not address scarring.
When can I return to work and exercise after BLT?
Most patients return to non-strenuous office work in one to two weeks. Strenuous exercise, swimming and contact sports are typically avoided for four to six weeks. RGP or scleral lens refitting is usually initiated once the cornea has stabilised, around three months.
Is Bowman layer transplant available on the NHS?
Yes, in a smaller number of UK NHS specialist cornea centres. Most NHS keratoconus services centre on cross-linking and, in advanced disease, DALK. Many patients self-fund private BLT to access an experienced ectasia surgeon and a faster pathway.