DALK

Deep Anterior Lamellar Keratoplasty (DALK)

A corneal transplant is a sophisticated operation and best in the hands of an experienced corneal surgeon. At Centre for Sight you have the peace of mind of being treated at an internationally renowned centre with patients referred from all over the world. Our expertise is not just from our years of experience but also from innovation and development of new techniques for corneal grafting as illustrated for example in the prize winning video on the Femtosecond Laser Deep Anterior Lamellar Keratoplasty page.

DALK (Deep anterior lamellar keratoplasty) is a partial thickness graft that preserves the TWO inner most layers of the cornea: Descemet's membrane and the endothelium. The goal of the procedure is to retain the endothelial layer of the host. This layer keeps the cornea clear by removing fluid from the bulk of the cornea. Retaining this layer avoids the risk of potentially blinding Graft Rejection that can occur with Penetrating Keratoplasty. If the endothelial layer is normal, then it is worth preserving.

The procedure requires technical skill and involves dissecting the cornea to almost 95% thickness, and removing the top layer. A donor corneal button is prepared by removing Descemet's membrane and donor endothelium. The donor graft is then stitched to the host. The cornea takes a little longer to clear but visual results can be similar to those of a penetrating keratoplasty.

Advantages

  • Closed eye surgery
  • No chance of blinding Endothelial rejection (by retaining the recipient's own endothelial layer)
  • Can always perform a Penetrating Keratoplasty if visual results are not satisfactory

Disadvantages

  • Technically challenging
  • Potential for interface scarring (and reduced visual clarity)

Femtosecond Laser Deep Anterior Lamellar Keratoplasty

This technique was first performed in the UK at Centre for Sight. Lasers are used to create a "tongue and groove" type incision on both the donor cornea and patient. The graft slots beautifully into place and heals very rapidly. Visual restoration is also very rapid. The video above illustrates the Daya Zag-Square technique.

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