ICL surgery risks and side effects
The real risks, how often they actually happen, and which ones the modern EVO lens largely designed away.
ICL surgery is considered very safe, but it is still intraocular surgery. The realistic risks are night-time halos and glare while the brain adapts, a temporary rise in eye pressure, a small early dip in corneal endothelial cells, and, uncommonly, a lens exchange if the size is not ideal. The cataract and pressure-spike risks that dogged older ICLs were largely eliminated by the EVO’s central port. Serious, vision-threatening complications are rare.
Every honest discussion of ICL has to separate three different things: risks that were real with the older generation of lens and are now largely historical, side effects that are common but temporary, and complications that are genuinely rare. Most of what you read online blurs all three together.
The surgeons who reviewed this page have ICLs in their own eyes
Both Gurpal Virdi, MD and Matt Hirabayashi, MD have undergone EVO ICL surgery themselves, and both have implanted the lens in their own family members. That is worth stating on a page about risk: the people writing it accepted these risks personally, and asked the people closest to them to do the same.
Watch: a refractive surgeon who became an ICL patient
Dr. Gurpal Virdi on knowing vision correction from both sides, as the surgeon and as the patient.
Also on YouTube.
What are the risks of ICL surgery?
Like any eye surgery, ICL carries a set of remote risks: infection, inflammation, glare or halos, a temporary rise in eye pressure, and, rarely, damage to the eye. Occasionally the lens needs to be adjusted or exchanged if the fit or the power is not optimal. The modern EVO lens lets fluid flow freely through a central port, which has greatly reduced the cataract and pressure-spike risks seen with older-generation lenses.
| Risk or side effect | How common | What happens about it |
|---|---|---|
| Halos / glare at night | Common early; usually fades | Neuroadaptation over weeks to months; EVO+ optic for large pupils |
| Temporary dryness | Common early | Preservative-free tears; resolves as post-op drops finish |
| Temporary pressure rise | Uncommon, early | Drops; usually settles within weeks |
| Endothelial cell loss | ~4% initial dip | Returns to normal age-related rate; monitored |
| Lens exchange for sizing | Uncommon | Lens swapped for a different size |
| Toric lens rotation | <0.5% | Repositioned or exchanged for a larger size |
| ICL-related cataract (EVO) | At or near zero | Central port keeps fluid flowing past the natural lens |
| Dislocation | ~0.07%, after eye trauma | Repositioned; vision preserved in published series |
Why the EVO ICL is safer than the older version
The EVO has a tiny central hole (the KS-AquaPORT) that keeps the eye’s natural fluid flowing around your own lens. That single design change largely eliminated the old cataract risk and removed the need for a separate laser hole in the iris before surgery. When you read older statistics about ICL and cataracts, check which generation of lens they describe.
Halos, glare and night vision
The central port can create a faint ring in certain lighting, and a pupil that dilates past the edge of the lens optic can cause halos. These effects sit on your line of sight rather than blocking it, and most people stop noticing them as the brain adapts over weeks to months. Bothersome, lasting cases are uncommon. If you have large pupils, that is a specific conversation to have before surgery, see halos and night vision after ICL.
Eye pressure after ICL
A mild, temporary pressure rise can happen early on, usually from leftover protective gel, the steroid eye drops, or a high vault, and is easily managed, often resolving within a month or two. A vault that stays too high and keeps pressure up can be corrected by exchanging the lens for a smaller size. This is one of the reasons vault is worth understanding.
The risk that sizing actually controls
Several items in the table above, rotation, a persistently high vault, a lens exchange, trace back to one thing: whether the lens length matches the space inside your eye. That is not a risk you manage after surgery; it is decided before it, when the size is chosen. It is why how an ICL is sized matters more to your outcome than most patients realize, and why it is worth asking a surgeon what method they use.
Risks that are commonly overstated online
- Floaters. There is no good evidence ICL causes floaters. Highly nearsighted eyes are simply more prone to them.
- Retinal detachment. Not increased by the ICL itself; the underlying high myopia carries the baseline risk.
- Cataract. A genuine concern with pre-EVO lenses. Near zero with the central-port design.
- Eye rubbing or sport. Normal activity is not a concern. Dislocation needs a direct, forceful blow, so eye protection for contact sports is sensible advice with or without an ICL.
Common questions about ICL risks
What is the downside of ICL surgery?
The main downsides are cost (it is elective and rarely covered by insurance), the fact that it is intraocular surgery rather than a surface procedure, night-time halos or a faint ring from the central port while your brain adapts, and the uncommon possibility that the lens has to be exchanged for a different size. It also does not correct age-related reading vision (presbyopia).
Do ICLs cause cataracts?
This was a real concern with older ICL designs, which carried roughly a 1% risk. The current EVO ICL has a central port that lets the eye’s fluid flow freely to nourish the natural lens, and large studies show the risk of ICL-related cataract is now at or near zero. Age-related cataracts can still develop as they would anyway.
Can a toric ICL rotate out of place?
Rotation is rare, large studies show repositioning is needed in under 0.5% of cases. It is mostly driven by an undersized lens producing too little vault, so accurate sizing is the best prevention. If it does rotate, the lens can be turned back into position or exchanged for a larger size.
Can an ICL move or dislocate?
Very rarely, about 0.07%, and essentially only after blunt trauma directly to the eye, such as a ball or an elbow during sports. A dislocated ICL can be repositioned, and in published series those patients did not lose vision.
Does ICL increase the risk of retinal detachment?
No. Long-term studies show the ICL itself does not change retinal detachment risk. However, many ICL patients are highly nearsighted, and high myopia carries its own baseline retinal risk, so regular dilated eye exams remain important after surgery.
Is long-term endothelial cell loss a concern?
ICL causes a small initial dip in corneal endothelial cells, around 4%, after which loss returns close to the normal age-related rate. For healthy eyes with adequate cell counts, the lifetime effect is generally not clinically significant.
How often does an ICL need to be exchanged?
It is uncommon, and it is the single best argument for careful sizing. Most exchanges are sizing-related, with a smaller share being toric-lens rotations. Better imaging and machine-learning vault prediction are specifically aimed at lowering this rate.
Next: what recovery actually looks like, or the full FAQ covering candidacy, sizing, cost and reversibility.
Educational content reviewed by ICL surgeons; not a substitute for an evaluation of your own eyes. Risk figures are drawn from published series and will differ for your specific eyes.