DMEK and DSEK — Partial-Thickness Corneal Transplants
Replacing only the failing inner layer of the cornea through a small incision, with visual recovery in weeks rather than years.
DMEK and DSEK are endothelial keratoplasty procedures: instead of replacing the whole cornea, they replace only the innermost cell layer, which is the layer that fails in Fuchs' dystrophy and after some eye surgery. The donor tissue is inserted through a small incision and held in place by an air bubble while it attaches. DMEK transplants the endothelium alone and gives the sharpest vision with the lowest rejection rate; DSEK includes a thin supporting layer and is more reliable in complex eyes. Dr. Feiz performs both at Aspen Surgery Center, often combined with cataract surgery.
Why the inner layer matters
The endothelium is a single layer of cells lining the back of the cornea, and its job is to pump fluid out and keep the cornea clear. Those cells do not regenerate. When enough of them are lost — through Fuchs' dystrophy, surgical trauma, or long-standing disease — fluid accumulates, the cornea swells, and vision becomes cloudy, typically worse in the morning and improving through the day. Once that pattern is established, no drop will fix it; the cells have to be replaced.
DMEK vs. DSEK
| DMEK | DSEK | |
|---|---|---|
| Tissue transplanted | Endothelium and Descemet's membrane only (~15 microns) | Endothelium plus a thin layer of stroma (~80–130 microns) |
| Visual quality | Sharpest; closest to a normal cornea | Excellent, marginally less crisp |
| Visual recovery | 2–6 weeks | 1–3 months |
| Rejection risk | Lowest | Low |
| Best suited to | Most patients with Fuchs' dystrophy and straightforward anatomy | Eyes with prior surgery, glaucoma tubes, poor iris support, or unusual anatomy |
DMEK is the better operation when the eye allows it, which is why it is the first choice for most Fuchs' patients. Insisting on DMEK in an eye that needs DSEK, however, risks a graft that will not stay attached — which is precisely the judgment a cornea fellowship trains for.
What the procedure involves
- Preparation — donor tissue is prepared and evaluated in advance. Surgery is outpatient at Aspen Surgery Center, under local anesthesia with sedation.
- Removing the diseased layer — the failing endothelium and Descemet's membrane are gently stripped away through a small incision.
- Inserting the graft — the donor layer is injected, unfolded, and positioned against the back of the cornea.
- Air bubble — an air or gas bubble is placed to hold the graft in position while it adheres.
- Positioning — you lie flat for most of the first day or two so the bubble presses the graft where it belongs. This is the part patients find most demanding, and it matters.
Dr. Feiz checks the graft the next day and at intervals afterward. A small percentage of grafts need a second air bubble to fully attach, which is a brief office or operating-room procedure and not a failure of the transplant.
Combined with cataract surgery
Fuchs' dystrophy and cataract frequently occur in the same eye and the same decade. Doing both together means one anesthetic, one recovery, and one course of drops, and it lets Dr. Feiz choose a lens implant knowing exactly how the cornea will behave afterward. For patients with mild Fuchs' and a visually significant cataract, the question of whether to transplant now or wait is worth a careful conversation — sometimes cataract surgery alone is enough for years.
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Frequently asked questions
What is the difference between DMEK and DSEK?
Both replace the cornea's failing inner cell layer through a small incision. DMEK transplants only the endothelium and its thin basement membrane, giving sharper vision and a lower rejection rate, but the tissue is delicate and the technique demanding. DSEK includes a thin layer of supporting stroma, which makes the graft easier to position and more reliable in eyes that have had previous surgery, a glaucoma tube, or an unusual anatomy. Dr. Feiz performs both and chooses based on your eye.
How long until I see well?
After DMEK, most patients see a clear improvement within two to six weeks. DSEK generally takes one to three months to reach its final result. Both are dramatically faster than a full-thickness transplant.
What is recovery like?
You lie flat for most of the first day or two so that an air bubble holds the graft in position against the cornea. After that, activity returns to normal quickly. Steroid drops continue long-term at a low dose to prevent rejection.
Can it be combined with cataract surgery?
Yes, and it frequently is. Many patients with Fuchs' dystrophy also have a cataract, and doing both in one procedure means one recovery rather than two.
What is the risk of rejection?
Lower than with full-thickness transplantation — around 1–2% for DMEK in published series, compared with substantially higher rates for PKP. Rejection, if it occurs, is usually treatable when caught early, which is why long-term follow-up and low-dose steroid drops matter.
Is it covered by insurance?
Yes. Corneal transplantation for endothelial disease is a medically necessary procedure covered by Medicare and medical insurance.