Why the Shift Toward Partial Transplants?
Why replace the whole cornea when only one layer is sick? Two decades of research settled it: transplanting only the affected layers significantly reduces rejection risk and, in suitable cases, delivers better visual outcomes than a full-thickness graft.
DALK, Deep Anterior Lamellar Keratoplasty
In DALK, the diseased front layers of the cornea are removed while your own healthy endothelium stays in place. That is the major advantage, because you keep your original endothelium, endothelial rejection risk is virtually zero. DALK suits keratoconus and scars limited to the front of the cornea.
DMEK and DSAEK, Endothelial Keratoplasty
Here the surgeon replaces only the very thin endothelial layer and leaves the rest of the cornea untouched. Visual outcomes are excellent, and recovery is significantly faster. DMEK gives sharper vision than DSAEK, but it demands a higher level of surgical expertise.
Comparing the Three Types
The short version: PKP for deep, full-thickness scars; DALK for keratoconus and anterior scars where the endothelium is still healthy; DMEK or DSAEK for Fuchs dystrophy and isolated endothelial damage.
The right transplant type is decided after a thorough evaluation of your case. Contact Dr. Ahmed Shaarawy's clinic for a specialist opinion.
Sources and references
Peer reviewed and professional sources used in the medical review of this article:
- DMEK versus DSAEK for corneal endothelial failureStuart et al., 2018 · Cochrane Database Syst Rev
- Systematic Review and Meta-Analysis of Clinical Outcomes of DMEK versus DSEKSingh et al., 2017 · Cornea
- Deep anterior lamellar keratoplasty versus penetrating keratoplasty for treating keratoconusKeane et al., 2014 · Cochrane Database Syst Rev
