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What Is Deep Anterior Lamellar Keratoplasty (DALK)?

Deep anterior lamellar keratoplasty (DALK) is a partial-thickness corneal transplant that replaces the corneal stroma down to Descemet's membrane while leaving the patient's own endothelium intact. It is used when the front corneal layers are diseased but the endothelium is healthy, such as in keratoconus or stromal scarring. Preserving the native endothelium lowers the risk of endothelial rejection and can improve long-term graft survival. Visual recovery is gradual and may require suture management and updated glasses or contact lenses.

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What Is Deep Anterior Lamellar Keratoplasty (DALK)?

Deep anterior lamellar keratoplasty (DALK) is a partial-thickness corneal transplant that replaces the corneal stroma down to Descemet's membrane while leaving the patient's own endothelium intact. It is used when the front corneal layers are diseased but the endothelium is healthy, such as in keratoconus or stromal scarring. Preserving the native endothelium lowers the risk of endothelial rejection and can improve long-term graft survival. Visual recovery is gradual and may require suture management and updated glasses or contact lenses.

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Why DALK Is Done

DALK is chosen when corneal clarity or shape is affected mainly by stromal disease rather than endothelial failure. It is commonly considered for advanced keratoconus with scarring or when specialty contact lenses are no longer tolerated. It may also be used for some stromal dystrophies or scars that do not involve the endothelium. Your surgeon will confirm endothelial health with exam findings and imaging before recommending DALK.

  • Keratoconus with significant stromal change
  • Stromal scars or stromal dystrophy
  • Healthy endothelium required

How DALK Is Performed

The surgeon trephines the cornea partially and removes diseased stroma while keeping Descemet's membrane and endothelium in place. In the big-bubble technique, air is injected to separate deep stroma from Descemet's membrane, which can allow a smoother interface for the donor tissue. A donor stromal button is placed and secured with sutures to stabilize the graft. Because the eye is not opened full thickness, some intraoperative risks can be reduced compared with penetrating keratoplasty.

Benefits Compared With Penetrating Keratoplasty

By keeping the patient's own endothelium, DALK largely avoids endothelial rejection, which is a major cause of full-thickness graft failure. The cornea can maintain better structural integrity because there is no full-thickness wound. Long-term graft survival can be favorable when the endothelium remains healthy. Visual outcomes can be excellent, although interface healing and suture-related astigmatism can influence final clarity.

Risks and Recovery

Possible complications include microperforation of Descemet's membrane, which may require conversion to penetrating keratoplasty during surgery. After surgery, suture-related astigmatism, interface haze, inflammation, or infection can occur. Vision typically improves over months as sutures are adjusted or removed and the cornea stabilizes. Keep follow-up visits and seek urgent care for increasing pain, redness, discharge, or sudden vision decrease.

FAQs on DALK

Does DALK eliminate rejection risk completely?

DALK greatly reduces the risk of endothelial rejection because the patient's own endothelium remains in place. However, immune reactions, inflammation, and infection are still possible, so monitoring and drops remain important. Your doctor will guide you on long-term follow-up.

How is DALK different from other lamellar keratoplasty types?

DALK is a specific anterior lamellar technique that aims to remove stroma down to Descemet's membrane. Some anterior lamellar procedures leave more stromal tissue behind depending on the condition and technique. Posterior lamellar procedures, such as endothelial keratoplasty, treat the back layers instead of the front.

How long do sutures stay in after DALK?

Sutures often remain for many months and may be adjusted or removed gradually to control astigmatism. Timing depends on healing, graft stability, and refraction changes. Your surgeon will decide based on exam findings at follow-up visits.

Can DALK be converted to penetrating keratoplasty?

Yes. If Descemet's membrane is perforated significantly during surgery or if safe deep dissection is not possible, the surgeon may convert to a full-thickness transplant. Conversion is a known contingency and is discussed during informed consent.

References

Deep Anterior Lamellar Keratoplasty. EyeWiki. https://eyewiki.org/Deep_Anterior_Lamellar_Keratoplasty. Date Accessed February 4 2026.

Cornea Transplantation. StatPearls (National Library of Medicine, National Institutes of Health). https://www.ncbi.nlm.nih.gov/books/NBK539690/. Date Accessed February 4 2026.

Deep Anterior Lamellar Keratoplasty Using Dehydrated Corneas in Fungal Keratitis. American Journal of Ophthalmology. https://www.sciencedirect.com/science/article/pii/S016164202300934X. Date Accessed February 4 2026.

Corneal Stromal Wound Healing: Major Regulators and Therapeutic Targets. PubMed Central. https://pmc.ncbi.nlm.nih.gov/articles/PMC9183221/. Date Accessed February 4 2026.

Corneal Stromal Repair and Regeneration. PubMed Central. https://pmc.ncbi.nlm.nih.gov/articles/PMC11926992/. Date Accessed February 4 2026.