ICL surgery: a complete guide
An objective, physician-reviewed guide to the EVO Implantable Collamer Lens: what it is, what it costs, and how surgeons decide it is right for your eyes.
Start here
Short, jargon-free guides built from the questions patients actually ask.
Am I a candidate?
Prescription range, your eye anatomy, dry eye, and what the work-up checks for.
Read →Risks & side effects
Cataracts, pressure, halos, endothelial cells, rotation, with how often each happens.
Read →ICL vs LASIK & PRK
How the options compare for high prescriptions, thin corneas, and dry eye.
Read →Sizing & vault
The technical heart of a good outcome, and where this site goes deepest.
Read →ICL surgery corrects nearsightedness and astigmatism by implanting a soft, permanent lens inside the eye, behind the iris, in front of your natural lens. Unlike LASIK it removes no corneal tissue, which makes it suitable for high prescriptions and thin corneas, and the lens can be removed or exchanged later. It takes about 5–10 minutes per eye, most vision recovers within a day, and it typically costs $4,000–$5,000 per eye in the US.
This page answers the questions people ask most about ICL surgery, in the order they usually ask them. Each answer is short and complete on its own; where there is more worth knowing, it links to a page that treats the subject properly. Everything here is reviewed by practising ICL surgeons who also publish peer-reviewed research on how the lens is matched to an individual eye.
What is ICL surgery?
ICL surgery implants a soft, permanent lens, the Implantable Collamer Lens, inside the eye, behind the coloured iris and in front of your natural lens, to correct nearsightedness and astigmatism. Unlike LASIK, no corneal tissue is removed, and the lens can be removed later if needed.
How does ICL surgery work?
The eye is numbed with drops and you stay awake but comfortable. The surgeon makes a tiny (~3 mm) self-sealing opening in the cornea and inserts the folded lens, which unfolds and is tucked behind the iris. It takes roughly 5–10 minutes per eye, needs no stitches, and both eyes are usually done the same day.
What are the benefits of ICL surgery?
It preserves corneal tissue, which makes it suitable for high prescriptions and thin corneas; it is gentler on the tear film than a corneal flap; it is removable and exchangeable; and because the lens sits inside the eye near the nodal point rather than out in front of it, the retinal image is not shrunk the way strong glasses shrink it, which is why many highly nearsighted patients see sharper than they ever did in glasses.
What is the downside of ICL surgery?
It is more expensive than LASIK and rarely covered by insurance; it is intraocular surgery rather than a surface procedure; night-time halos are common early while your brain adapts; and uncommonly a lens has to be exchanged for a different size. It also does not correct age-related reading vision.
What are the risks and side effects of ICL surgery?
The realistic risks are night-time halos and glare, a temporary rise in eye pressure, a small early dip in corneal endothelial cells, and, uncommonly, a lens exchange. The EVO’s central port largely eliminated the cataract and pressure-spike risks associated with older ICL designs. Serious complications are rare.
Is ICL better than LASIK?
Neither is universally better, they suit different eyes. ICL is usually preferred for high prescriptions, thin or borderline corneas, dry-eye-prone eyes, and anyone who wants a removable correction. LASIK is quick and well proven for low-to-moderate prescriptions with healthy, thick-enough corneas.
Who cannot have ICL surgery?
ICL is generally not suitable if you already have a cataract, if your prescription is still changing, if your anterior chamber depth or endothelial cell count is too low, or if you have untreated eye disease such as uncontrolled glaucoma or active keratoconus. Most of these are assessed at a single evaluation.
How long does ICL recovery take?
Vision usually improves dramatically within the first day, and most normal activities resume within a few days. Plan on about a week off strenuous exercise and heavy lifting and swimming, which is about how long the microscopic openings take to heal. By roughly a month, everything has settled.
How much does ICL surgery cost?
In the United States, typically around $4,000–$5,000 per eye, roughly $8,000–$10,000 for both. It is elective, so insurance almost never covers it, but it is generally FSA- and HSA-eligible and most practices offer financing, often with a 0% interest option.
What is the age limit for ICL surgery?
The EVO ICL is FDA-approved for adults aged 21 to 60, after the upper limit was expanded from 45 in February 2026. In practice the lower bound is about prescription stability and the upper bound is about whether a cataract has begun, not about age itself.
Does ICL cause halos at night?
Some night-time halos and glare are common early on, from the lens’s central port and from a pupil that dilates past the edge of the optic. They sit on your line of sight rather than blocking it, and most people stop noticing them as the brain adapts over weeks to months.
Can an ICL be removed?
Yes. An ICL can be removed or exchanged, and because the cornea was never reshaped the eye returns essentially to its original prescription. “Removable” is more accurate than “reversible&rdquo, though, removal is still surgery, with its own small risks.
Does the ICL block UV light?
Yes. Collamer, the material the lens is made from, carries a built-in UV filter, a property of the material, not a coating. The limit worth knowing: the lens sits behind the iris, so it protects the back of the eye and does nothing for your cornea, eyelids or surrounding skin. It does not replace sunglasses.
How long does an ICL last?
Indefinitely. The ICL is designed as a permanent implant; there is no expiry date and no replacement schedule, and Collamer does not wear out or cloud the way a contact lens does. It stays in the eye until there is a specific reason to remove it, which for most people is cataract surgery decades later.
How is an ICL size chosen?
The EVO ICL comes in four lengths, 12.1, 12.6, 13.2 and 13.7 mm, and the lens must match the space inside your eye where it rests. Older methods estimate this from the cornea’s white-to-white width; modern methods measure the eye directly and use machine-learning models to predict the result for each size.
What is ICL vault?
Vault is the small gap between the back of the ICL and your natural lens, measured in microns. There is no single correct vault number, it differs between eyes and shifts within the same eye as your pupil changes with light. The goal is a lens that fits your eye across conditions.
Where this site goes deeper than most
Most ICL information online stops at the level of the answers above. The part that most affects your result, which of the four lens sizes goes into your eye, is usually skipped entirely, because it is a surgeon’s problem rather than a patient’s. We treat it at length anyway, because it is what separates a good outcome from a lens exchange. Start with how an ICL is sized and what vault means, then see the peer-reviewed research behind it.
Educational content reviewed by ICL surgeons; not a substitute for professional medical advice. Always consult a qualified ophthalmologist about your own eyes.
Honest information, from people who do this every day
Every page is medically reviewed by ophthalmologists Dr. Gurpal Virdi and Dr. Matt Hirabayashi, who specialize in ICL and research how the lens is matched to each eye. They also co-founded ICLFit.com, an AI tool that helps surgeons choose the right lens for an individual eye.