DSAEK Surgery: What It Is, the Procedure, and Recovery

DSAEK, short for Descemet stripping automated endothelial keratoplasty, is a partial-thickness corneal transplant that replaces only the thin inner layer of the cornea responsible for keeping it clear. Unlike older full-thickness transplants that swap out the entire cornea, DSAEK works through a small incision, requires few or no sutures, and typically restores useful vision within weeks rather than months. It has become one of the most commonly performed corneal transplant techniques worldwide, though a newer procedure called DMEK is gaining ground in some settings.

Why the Inner Layer of the Cornea Matters

The cornea stays transparent because a single layer of cells on its back surface, the endothelium, constantly pumps fluid out of the corneal tissue. This pump-leak mechanism keeps the cornea at just the right hydration level; without it, the cornea swells, becomes cloudy, and vision deteriorates.¹ Human endothelial cells do not regenerate in any meaningful way. Once enough of them die off, the remaining cells cannot keep up, and the cornea becomes waterlogged.

The two most common reasons people need DSAEK are Fuchs endothelial dystrophy, a genetic condition where endothelial cells gradually die over decades, and pseudophakic bullous keratopathy, where endothelial damage follows cataract surgery or other intraocular procedures.² Less commonly, DSAEK is used after failed previous transplants or for certain congenital endothelial diseases in children.

What Happens During the Surgery

The basic idea is straightforward: the surgeon removes the patient’s diseased endothelium and Descemet membrane from the back of the cornea, then inserts a thin disc of healthy donor tissue to take its place. That donor disc includes endothelium, Descemet membrane, and a thin layer of the stroma (the cornea’s structural middle layer). In the original technique described in large case series, this disc is typically 8 to 9 millimeters wide and is inserted through an incision of about 5 millimeters, with sutures used only to close the wound itself rather than to hold the graft in place.³

Getting that donor tissue into the eye without damaging its delicate cells is one of the trickiest parts of the operation. Surgeons use various insertion devices, and the choice matters. Studies comparing different glide systems have found meaningful differences in how many donor cells survive the insertion process. In one trial comparing the EndoGlide device to the Busin glide, endothelial cell loss at six months was roughly 26% in the EndoGlide group versus 47% in the Busin group, with similar visual outcomes between the two.⁴ At three years, the EndoGlide group maintained better graft survival, particularly in eyes with pseudophakic bullous keratopathy.⁵ Other comparisons between the Sheets glide and Busin glide have shown more similar results, suggesting the differences depend on the specific devices rather than the concept of using a glide at all.⁶

Once the donor tissue is positioned inside the eye, the surgeon injects an air bubble beneath it. This bubble presses the graft against the back surface of the patient’s cornea and holds it in place while natural biological adhesion develops over the first hours and days. The air is gradually absorbed by the body. In many protocols, the anterior chamber is fully filled with air and the pressure is set to around 20 mmHg, which helps the graft stay attached during the critical early period.⁷

The First Days After Surgery

Most patients are told to lie face-up (supine) for several hours after DSAEK to keep the air bubble pressing against the graft. How long this positioning matters has been debated, and the evidence suggests it may be less critical than many surgeons once believed. One study found that when the anterior chamber was fully filled with air, the graft dislocation rate was low regardless of whether patients stayed supine, with no statistically significant difference between the positioning and no-positioning groups.⁷ A randomized trial for the related DMEK procedure also found no clinically relevant benefit to prolonged supine positioning for graft attachment.⁸ Still, most surgeons ask patients to stay on their backs for at least a few hours as a precaution, since the air bubble does the heavy lifting during that window.

You will use steroid eye drops for months after surgery to prevent rejection. This is one of the most important parts of your recovery, and stopping steroid drops prematurely is a major risk factor for graft rejection. One study found that stopping steroids was associated with a more than five-fold increase in the risk of a rejection episode.⁹ Many corneal specialists keep patients on a low-dose steroid drop indefinitely.

Graft Detachment and Rebubbling

The most common early complication of DSAEK is partial or complete detachment of the donor tissue from the host cornea. When this happens, the surgeon performs a “rebubble,” which means injecting another air bubble into the anterior chamber to press the graft back into place. Across large case series, the rebubbling rate for DSAEK runs in the range of roughly 9% to 28%, depending on the center, the insertion technique, and the graft thickness used.¹⁰¹¹ This sounds alarming, but rebubbling is a brief office procedure and usually works. In one large retrospective review of 80 eyes that needed rebubbling, successful reattachment was achieved in about 96% of cases.¹²

Several factors raise your risk of needing a rebubble. A history of retinal surgery, using very thin donor grafts (under 50 micrometers), forceps insertion rather than a glide device, preloaded tissue, and donor history of non-insulin-dependent diabetes have all been identified as risk factors.¹⁰ Surgeon-cut tissue may have a slightly lower rebubbling rate than preloaded tissue prepared by an eye bank, though the difference in one study did not reach statistical significance.¹³

Eye Pressure and Steroid-Related Glaucoma

Elevated eye pressure is a concern both immediately after DSAEK and in the months that follow. In the first day or two, the air bubble itself can cause a spike in intraocular pressure, sometimes through pupillary block, where air trapped behind the iris pushes it forward and closes the eye’s drainage angle. This has been estimated to occur in roughly 13% of DSAEK patients.¹⁴

The longer-term pressure concern is steroid-induced ocular hypertension. Because you need steroid drops for months or longer, a significant fraction of patients develop elevated pressure from the drops themselves. One study found steroid-induced pressure elevation in about 38% of DSAEK recipients, with pre-existing higher eye pressure being a strong predictor.¹⁵ People who already have glaucoma before surgery are at even higher risk and are more likely to need a glaucoma procedure afterward.¹⁶ The reassuring part is that steroid-related pressure elevation is manageable: your doctor can switch to a lower-potency steroid, add a pressure-lowering drop, or adjust the dosing schedule.

Graft Rejection

Rejection, where your immune system attacks the donor tissue, is less common after DSAEK than after full-thickness transplants. In one prospective study tracking over 350 DSAEK eyes, about 8.5% developed a rejection episode, with the risk rising over time to roughly 14% at two years and 22% at three years.⁹ Signs include redness, light sensitivity, blurred vision, and sometimes pain. Caught early, rejection episodes can often be reversed with intensive steroid treatment. The critical takeaway: never stop your steroid drops without your surgeon’s explicit guidance.

Visual Recovery and Refractive Changes

One of the biggest selling points of DSAEK over full-thickness transplants is faster visual recovery. Vision typically starts improving within the first few weeks and continues to sharpen over several months. Because the front surface of the cornea is left intact, DSAEK produces far less astigmatism than a full-thickness transplant. However, the added tissue on the back surface does cause a mild hyperopic (farsighted) shift of roughly +0.7 to +1.2 diopters, depending on whether the procedure is done alone or combined with cataract surgery.¹⁷ This shift is fairly predictable and can be accounted for when choosing a lens implant during combined cataract-DSAEK surgery.

How sharp your final vision gets depends heavily on what was wrong before surgery and on the health of the rest of the eye. Many patients with Fuchs dystrophy and otherwise healthy eyes reach 20/30 to 20/40, which is comfortable for daily tasks. The thinner the donor tissue, the better the final acuity tends to be, which is why ultrathin DSAEK has emerged as a refinement.

Ultrathin DSAEK

Standard DSAEK grafts are typically 100 to 200 micrometers thick. Ultrathin DSAEK (UT-DSAEK) uses grafts thinner than 100 micrometers, often in the 50 to 100 micrometer range. The idea is simple: a thinner graft causes less optical distortion and allows better vision. A randomized multicenter trial confirmed this, finding that ultrathin grafts produced significantly better visual acuity at 3, 6, and 12 months compared to standard-thickness grafts, with similar rates of complications and endothelial cell loss.¹⁸

Preparing these thin grafts requires precision. Eye banks use mechanical microkeratomes to cut the donor tissue, selecting blade sizes based on the central thickness of the donor cornea to hit a target graft thickness, often around 125 micrometers plus or minus 25.¹⁹ The trade-off with going very thin (below 50 micrometers) is a higher rebubbling rate, as the thinnest grafts seem more prone to detachment.¹⁰

How DSAEK Compares to DMEK and Full-Thickness Transplants

Three main transplant options exist for endothelial disease: full-thickness penetrating keratoplasty (PK), DSAEK, and Descemet membrane endothelial keratoplasty (DMEK). DMEK is the thinnest transplant of all, replacing only the endothelium and Descemet membrane without any stromal tissue. This gives it an optical advantage: DMEK consistently produces better best-corrected vision than even ultrathin DSAEK, with studies showing significantly sharper acuity at 3, 6, and 12 months.²⁰

But DMEK comes with a catch: it has a notably higher complication rate, particularly for graft detachment and the need for rebubbling. The same meta-analysis found total complications occurred in about 57% of DMEK eyes versus 25% of UT-DSAEK eyes, and rebubbling rates were about 34% for DMEK compared to 11% for UT-DSAEK.²⁰ DMEK is also technically more demanding for the surgeon, and it can be difficult or impossible to perform in certain eyes, such as those with prior glaucoma surgery, iris abnormalities, or aphakia (no lens implant). In those complex situations, DSAEK remains the preferred technique.

Full-thickness PK, the oldest approach, actually has the best long-term graft survival. A ten-year study found graft survival of about 92% for PK, compared to roughly 73% for DSAEK and 75% for DMEK.²¹ However, PK takes much longer to heal, requires sutures for a year or more, introduces substantial astigmatism, and carries a higher risk of traumatic wound rupture. Visual recovery after DSAEK and DMEK is significantly faster than after PK.²¹ From a cost-effectiveness standpoint, DSAEK has been found to dominate PK in the United States, meaning it costs less and delivers more quality-adjusted life-years.²²

Long-Term Endothelial Cell Loss

This is where the honest picture gets a little sobering. Donor endothelial cells continue to die after transplantation, and the rate of loss is steeper than in a normal eye. One ten-year follow-up of DSAEK grafts found average cell loss of about 47% at one year, 55% at three years, 60% at five years, and 73% at ten years.²³ Eventually, if cell density drops below a critical threshold, the graft fails and may need to be replaced. The ten-year study comparing all three techniques found that DSAEK and DMEK grafts both lose endothelial cells faster than PK grafts, and the probability of maintaining a healthy cell density above 1,000 cells per square millimeter at ten years was only about 8% for DSAEK.²¹

This does not mean every DSAEK graft fails at ten years. The cornea can remain clear even at relatively low cell densities, and many grafts continue functioning well beyond the point where cell counts alone might suggest trouble. But it does mean that younger patients should understand they may need a repeat transplant at some point in their lives.

Combining DSAEK with Cataract Surgery

Because Fuchs dystrophy and cataracts often coexist in the same age group, surgeons frequently perform cataract removal and lens implant placement at the same time as DSAEK. This “triple procedure” avoids putting the patient through two separate surgeries and recoveries. Studies have found that the combined approach produces good visual outcomes and reliable graft attachment.²⁴ Compared to a combined PK-cataract surgery, the DSAEK triple procedure offers better refractive predictability and less astigmatism.²⁵

One practical challenge with the triple procedure is choosing the right power for the lens implant. The DSAEK graft changes the back surface of the cornea, which shifts your prescription in the farsighted direction. Standard lens-power formulas were not designed for this scenario and tend to undershoot, leaving patients more farsighted than intended. Optimizing the calculation constant used in these formulas significantly improves accuracy. In one study, using an adjusted constant brought about 83% of patients within 1 diopter of their target refraction, compared to only 50% using the manufacturer’s default constant.²⁶

DSAEK in Children

Corneal endothelial failure in children is rare but devastating, because a cloudy cornea during the critical years of visual development causes amblyopia (lazy eye) that can become permanent if not treated quickly. The most common reason for pediatric DSAEK is congenital hereditary endothelial dystrophy.²⁷ A meta-analysis pooling data on 154 pediatric DSAEK eyes found that average visual acuity improved substantially, going from roughly 1.36 logMAR before surgery to 0.51 logMAR afterward.²⁷

DSAEK has several advantages over full-thickness transplants in children. The procedure is performed in a closed system, meaning the eye is never fully open during surgery, which reduces the risk of complications under general anesthesia. Healing is fast, and sutures can typically be removed within two to four weeks, allowing amblyopia treatment with patching and glasses to begin promptly.²⁸ DSAEK has been performed successfully in children as young as two years old.²⁹ Graft dislocation remains the most frequent complication in pediatric cases, but given that the alternative is a full-thickness transplant with a year of sutures in a child who cannot be told to avoid rubbing their eye, DSAEK offers a clear practical advantage.

Preoperative Imaging and What Your Surgeon Is Looking For

Before DSAEK, your surgeon will gather detailed measurements of the cornea and the front of the eye using several imaging technologies. Specular microscopy counts and evaluates the remaining endothelial cells to confirm they are too depleted to recover. Anterior segment optical coherence tomography (AS-OCT) maps corneal thickness, anterior chamber depth, and the drainage angle of the eye. Scheimpflug imaging (Pentacam) provides a three-dimensional model of the cornea, including measurements of corneal clarity called densitometry.³⁰ These measurements help determine the right graft size, detect any anatomical features that might complicate surgery (like a shallow anterior chamber), and establish a baseline to track progress afterward. The imaging also helps your surgeon decide whether DSAEK or DMEK is the better fit for your particular eye.

After surgery, many of these same imaging tools are used to confirm the graft is attached, measure its thickness, and monitor the posterior corneal curvature changes that cause the expected hyperopic shift. A randomized trial tracking corneal power changes found the shift stabilizes by about 12 months in both DMEK and ultrathin DSAEK, with no significant difference between the two techniques in how much the back surface curvature changed.³¹