A corneal transplant often comes after years of poor vision, waiting lists, and surgery. Being told you now need a contact lens to see well can feel like putting all of that at risk. It’s a fair question, and it deserves a straight answer rather than reassurance.
What graft rejection is
Rejection is when your immune system recognizes the donor tissue as foreign and attacks it. It is the leading cause of graft failure after a full-thickness transplant (penetrating keratoplasty, or PK). Partial-thickness transplants such as DALK, DSAEK, and DMEK have lower rejection rates in long-term studies.[1]
Rejection can happen with or without a contact lens, and it isn’t limited to the first months. In a 10-year review of 1,927 full-thickness transplants at one eye center, 9.55% had a first rejection episode. About half of those episodes (53.3%) happened in the first year after surgery; the rest came later.[2]
There is real good news here too. In that same review, 63.3% of rejection episodes were reversed, among patients followed for at least three months afterward.[2] Reviews of graft rejection describe early detection and prompt steroid treatment as the core of management.[3] Spotting it early is something you can actively help with.
What the research says about scleral lenses and rejection
Scleral lenses are widely used after transplants. A 2025 systematic review of 15 studies covering 464 transplanted eyes found scleral lenses were the lens fitted most often, and every study reported better vision with lenses.[7]
Rejection does show up in these groups:
- In a US series of 48 eyes fitted after full-thickness transplants, 6 eyes (12.5%) had a rejection episode, and 3 of them went back to lens wear.[5]
- In an Israeli series followed for an average of 5.2 years, 30.0% of eyes had at least one rejection episode.[6]
- Across the systematic review, graft rejection was the most often reported complication, in 18 of the 464 eyes.[7]
Here is the important part. None of these studies compared lens wearers with similar grafts that had no lens. Without that comparison, nobody can say whether the lens raised the risk, lowered it, or made no difference. Grafts reject on their own. The honest answer is: unknown, and worth watching.
Why fit and follow-up matter
The one thing researchers have measured clearly is swelling. The cornea’s inner cell layer keeps it clear by pumping fluid out, and a transplant has fewer of those cells. Any lens covering the cornea slightly reduces its oxygen, so a graft can swell more than a healthy cornea.
- In a study of 9 transplanted eyes, about six hours of scleral lens wear caused corneal swelling averaging 2.99%. The authors cite 1 to 2% for healthy corneas under similar conditions. They urged careful lens design for every transplanted eye, to limit stress on the graft that could contribute to rejection or failure over the long term.[8]
- In a three-center study of 31 eyes at least five years after a transplant, smaller scleral lenses caused no more swelling than wearing no lens, while corneal rigid lenses and large scleral lenses caused more. All of the grafts stayed clear.[9]
So the concern is real, but it is also something a fitter can design around. That is why it matters to have a fitter who sees transplanted eyes often and who works with your surgeon. Read more on the corneal transplant condition page and the full evidence in scleral lenses and corneal transplants: the research.
Know the warning signs
Graft rejection symptoms are often remembered as RSVP: Redness, Sensitivity to light, Vision getting worse, and Pain. A large US transplant study asked about exactly these at every visit.[4] In the 10-year review of transplants above, 87% of patients with a first rejection episode had symptoms, most often loss of vision.[2]
Symptoms don’t catch everything, though. In the US study, which followed people at high risk of rejection, these symptoms picked up only 46% of graft reactions at six months.[4] That is why scheduled checks with your surgeon matter even when your eye feels fine.
The tricky part for a lens wearer is that some of these signs can also come from the lens itself. Don’t try to work out which it is. If you notice them, take the lens out, keep it in its case, and call.[10]
What helps protect your graft
- Let your surgeon set the timing. Fitting usually waits until the graft is stable and the surgeon is done with stitches.
- Keep both doctors in the loop. Ask your fitter to send reports to your surgeon, and tell each of them about any change in drops or symptoms.
- Keep taking your prescribed drops. Many people with grafts use steroid drops long term. Ask how to time them with your lens: see steroid and antibiotic drops with scleral lenses.
- Follow your wear schedule exactly, and don’t sleep or nap in the lens unless your surgeon has told you otherwise.
- Handle the lens gently, and never rub the eye.
- Keep every graft check, even in years when everything feels fine.
Questions to ask
- How many patients with transplants do you fit, and will you share reports with my surgeon?
- How will you design the lens to limit swelling of my graft? Will you check how my cornea responds after a few hours of wear?
- Which symptoms do you want to hear about, and which should go straight to my surgeon?
- If I have a rejection episode, what happens to my lens wear?
If you’re not sure your fitter is the right match for a transplanted eye, see finding a scleral lens specialist.
Common questions
If I have a rejection episode, will I have to stop wearing my scleral lens?
Not necessarily, but that's your surgeon's decision. In a US series of 48 transplanted eyes fitted with scleral lenses, 6 had a rejection episode and 3 of those went back to wearing their lenses. Expect your surgeon to want the lens out while the episode is treated.
Can rejection happen without any symptoms?
Yes. In a large transplant study, patients were asked about redness, light sensitivity, vision loss, and pain at every visit, and those symptoms picked up fewer than half of graft reactions at six months. That's why routine graft checks matter even when the eye feels fine.
My graft is many years old. Am I past the risk?
Not entirely. In a 10-year review of 1,927 full-thickness transplants at one center, about half of first rejection episodes happened in the first year, which means the rest came later. Keep your surgeon's follow-up schedule however old the graft is.
Does the type of transplant make a difference?
It does for rejection risk. A 2021 review reported lower rejection rates in long-term studies of partial-thickness transplants, as low as 1.7 to 2.8% for DMEK, than for full-thickness grafts. Most scleral lens research after transplants involves full-thickness grafts, so there is less direct evidence for the others.
Is a scleral lens safer for my graft than a smaller rigid lens?
There's no simple answer. In one three-center study of older full-thickness grafts, corneal rigid lenses and large scleral lenses caused more swelling than no lens, while smaller scleral lenses did not. The best design depends on your graft, so ask your fitter how they'll choose.