Partial vs Full Corneal Transplant: DALK, PKP & DMEK Compared

Corneal transplantation is an advanced surgical procedure used to replace either part or all of the damaged corneal tissue, with the goal of restoring clear vision. At the practice of Dr. Ahmed Shaarawy — consultant cornea and refractive surgeon — every type of transplant is performed after a careful, individualized assessment, using modern microsurgical techniques.

The two most common types are the partial transplant (DALK) and the full-thickness transplant (PKP). Both treat corneal disease, but they differ meaningfully in technique, complications, recovery, and success rates.

What Is a Full-Thickness Corneal Transplant (Penetrating Keratoplasty — PKP)?

In this procedure, the entire cornea — all five layers — is replaced with a donor graft of healthy corneal tissue.

When PKP is the right choice:

• Damage involves the full thickness of the cornea.

• Deep scarring or severe thinning.

• Failure of a previous transplant.

• Disease that affects every layer of the cornea.

Advantages:

• Comprehensive — replaces every layer.

• Suitable when the damage is widespread.

Trade-offs:

• Longer recovery (6–12 months).

• Higher risk of graft rejection.

• May require suture removal later.

What Is a Partial Corneal Transplant (Deep Anterior Lamellar Keratoplasty — DALK)?

This is a more selective technique. Only the front and middle layers of the cornea are replaced — the inner endothelial layer is preserved when it's healthy.

When DALK is the right choice:

• Keratoconus.

• Superficial or mid-stromal scarring.

• Disease that doesn't involve the corneal endothelium.

• Younger patients in whom we want to minimize the risk of immune rejection.

Advantages:

• Substantially lower rejection risk.

• Faster visual recovery.

• Preserves the natural anatomy of the eye.

• A safer option for patients with only one functional eye.

Trade-offs:

• Requires very advanced surgical technique.

• Not suitable when the corneal endothelium is damaged.

Is There a Third Option? (Endothelial Keratoplasty)

Yes — there are precise techniques designed specifically for cases where damage is limited to the inner endothelial layer of the cornea while the front layers remain healthy. These are known as endothelial keratoplasty:

1. DMEK (Descemet Membrane Endothelial Keratoplasty)

• Transplants only the Descemet membrane and endothelial cells.

• Advantages: most precise technique, faster visual recovery, very low rejection rate (≈1%), no sutures.

• Trade-offs: technically demanding — requires significant surgical experience.

• At Dr. Ahmed Shaarawy's practice: performed using the S-stamp DMEK technique.

2. DSAEK (Descemet Stripping Automated Endothelial Keratoplasty)

• Transplants the endothelium with a thin layer of corneal stroma.

• Advantages: technically easier than DMEK — stable outcomes.

• Trade-offs: slightly thicker graft — slower visual recovery.

3. PDEK (Pre-Descemet Endothelial Keratoplasty)

• Transplants three layers: pre-Descemet + Descemet + endothelium.

• Suitable for selected cases — good vision within days.

How Does Dr. Shaarawy Decide Which Transplant Is Right for You?

The decision is based on:

• Corneal topography + OCT

• Endothelial assessment (specular microscopy)

• Corneal thickness and the patient's clinical history

Dr. Ahmed Shaarawy was the first surgeon to introduce S-stamp DMEK in Egypt and brings sub-specialty precision to selecting the right transplant for each individual case.

Frequently Asked Questions

Is a partial transplant always better than a full transplant?
Not always — it's the better choice in specific cases such as keratoconus, but it isn't universally superior.

Is there a cost difference?
Yes — partial transplants are often more expensive because of the surgical complexity, but they're safer and recover faster.

Does a full transplant restore 100% of vision?
Vision usually improves significantly, but glasses may still be needed.

How long is recovery after transplant?
Partial transplant: 1–3 months. Full transplant: 4–12 months.

Has your doctor recommended a corneal transplant?
Book your evaluation with Dr. Ahmed Shaarawy to identify the right type for your case and restore your vision with the most appropriate modern technique.

📍 Book now at: https://cornea.clinic/book