Implantable contact lens (ICL) (Phakic intraocular lens implantation)
An elective operation that places a thin lens permanently inside the eye, in front of your own natural lens, to reduce or remove the need for glasses or contact lenses.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- An ICL is a lens placed permanently inside the eye, in front of your natural lens — useful when laser is unsuitable, for example with thin corneas or very strong prescriptions.
- Because the eye is opened and an implant placed inside, it carries inside-the-eye risks (such as raised pressure, cataract or, rarely, infection) that surface laser does not.
- The lens must sit at the right depth (the 'vault'); too high or too low can need the lens to be exchanged, and the inner layer of the cornea needs lifelong monitoring.
- It is elective surgery on a healthy eye; choose a clinic registered with your nation's healthcare regulator (the CQC in England, Healthcare Improvement Scotland, Healthcare Inspectorate Wales or RQIA in Northern Ireland) and a GMC-registered surgeon following Royal College of Ophthalmologists standards, and never decide under time pressure.
A plain-English summary. The detail — including risks and recovery — is below.
At a glance
A general guide. Your surgeon will give you advice for your situation.
Can greatly reduce, and for many people remove, the everyday need for glasses or contact lenses for distance vision
A low cornea inner-cell (endothelial) count, where an implant could risk the cornea clouding.
The eye may be sore, watery and light-sensitive, and vision hazy. Eye pressure is often checked the same day or next day, as it can rise. Rest, avoid...
An early eye-pressure check, as pressure can rise soon after surgery.
The eye may be sore, watery and light-sensitive, and vision hazy. Eye pressure is often checked the same day or...
Vision usually clears noticeably. Use prescribed drops as directed and attend early checks. Avoid swimming, dusty...
Vision and any glare or haloes usually settle. Most normal activities, including exercise, can resume once your...
Vision stabilises and the surgeon confirms the lens position (vault) and pressure are satisfactory.
What is an implantable contact lens (ICL)?
An implantable contact lens (ICL) is a thin, soft lens that a surgeon places permanently inside the eye to correct short-sightedness, long-sightedness or astigmatism. Unlike a normal contact lens, you do not see or feel it and it is not removed daily — it sits behind the coloured iris, in front of your own natural lens.
Unlike laser eye surgery, an ICL does not reshape or remove any corneal tissue. This makes it an option for people whose corneas are too thin or whose prescription is too strong for laser, and it can in principle be removed or exchanged if needed. Most modern ICLs have a tiny central hole to let fluid flow naturally inside the eye.
This is elective, lifestyle surgery on a healthy eye that involves opening the eye and placing an implant inside it — so it carries more 'inside-the-eye' risk than laser surface treatments. It is funded privately and should be considered carefully, not sold quickly.
It is important to be realistic. An ICL aims to reduce dependence on glasses, not to guarantee perfect vision forever. You keep your own natural lens, so you will still develop age-related reading difficulty (presbyopia) from your mid-40s and can still develop cataract later in life.
Types & techniques
There isn't one single operation. The right approach depends on you — which is something to discuss with your surgeon.
ICL vs laser eye surgery
| Feature | ICL (lens implant) | Laser (LASIK/surface) |
|---|---|---|
| Changes the cornea? | No tissue removed | Reshapes the cornea |
| Implant in the eye? | Yes, permanent lens | No implant |
| Thin corneas / strong prescriptions | Often preferred | May be unsuitable |
| Reversible? | Lens can be removed/exchanged | Reshaping is permanent |
| Main extra risks | Inside-the-eye: pressure, cataract, rare infection | Dry eye, night glare, haze/flap |
Neither is universally 'better'. The right choice depends on your prescription, corneal thickness, eye anatomy and age. A responsible surgeon will say if neither is appropriate.
Preparing for your surgery
- Expect a detailed assessment of your eye anatomy, including the space inside the eye, corneal inner-cell (endothelial) count and prescription stability, to choose the right lens size.
- Stop wearing contact lenses before your assessment as advised, as they alter measurements.
- Tell the clinic about glaucoma or raised eye pressure, previous eye problems, diabetes or autoimmune conditions, as these affect suitability.
- Tell them if you are pregnant or breastfeeding, as your prescription can change and surgery is usually delayed.
- Ask whether a small laser hole in the iris is needed beforehand, depending on the lens type.
- Arrange a lift home and someone to help for the first day or two, and use any prescribed drops beforehand if instructed.
- Ask for the written patient information and the Royal College of Ophthalmologists patient checklist, and read it before consenting.
What happens
ICL surgery is usually done with numbing eye drops, sometimes with light sedation to help you relax, and occasionally under general anaesthetic. You lie flat and a clip gently holds the eyelids open.
The surgeon makes a tiny opening at the edge of the cornea, gently inserts the folded lens, and positions it behind the iris in front of your natural lens, where it unfolds and settles. The opening is so small it usually seals itself without stitches. For toric (astigmatism) lenses the surgeon also aligns the lens to the correct angle.
Each eye usually takes around 15–30 minutes, and the eyes are often treated on the same day or a few days apart depending on the surgeon. Your eye pressure is checked afterwards, as it can rise in the first hours, and you go home with drops and clear instructions once the surgeon is satisfied.
Is this operation right for me?
A good consultation should explore whether it's the right choice for you now — including reasons to wait or consider something else.
May not be suitable if…
- A low cornea inner-cell (endothelial) count, where an implant could risk the cornea clouding.
- Too little space inside the eye, or a narrow drainage angle, raising the risk of pressure problems.
- Glaucoma or poorly controlled raised eye pressure.
- An unstable prescription, active eye disease, or significant cataract already present (where lens replacement may suit better).
- Unrealistic expectations of perfect, permanent, glasses-free vision.
Delay surgery if…
- You are pregnant or breastfeeding, which can change your prescription.
- Your prescription has changed in the last 1–2 years.
- You have an active eye infection or inflammation.
- You wear contact lenses and have not left them out long enough before assessment.
- You feel pressured by a time-limited offer rather than ready to decide.
Alternatives to discuss
- Continuing with glasses or contact lenses, which carry no surgical risk.
- Laser eye surgery (LASIK or surface laser) if the cornea is suitable.
- Refractive lens exchange in older patients, especially with early cataract.
- Simply waiting and monitoring if symptoms or motivation are limited.
- A second opinion if you are unsure an implant inside the eye is right for you.
Before you decide
Use this as a shared-decision checklist. The aim is not just “can this be done?”, but whether it is right for you, now, with the risks and alternatives clearly understood.
What matters most to me?
Think about symptoms, daily life, work, caring responsibilities, sport, fertility, travel, appearance and anxiety — the right choice depends on your priorities, not just the medical facts.
What are all my options?
Ask about waiting, monitoring, medicines, rehabilitation, a smaller or larger procedure, a different test, NHS referral, or a second opinion where that would help.
What would make me pause?
Active infection, pregnancy, unstable medical problems, smoking, medicines that increase bleeding, poor support at home, or feeling pressured are all reasons to slow down and get tailored advice.
What happens if I do nothing today?
For some problems, waiting is safe; for others, delay can make treatment harder. A good consultation should explain the trade-off in plain English.
Anaesthetic choices
The safest option depends on the operation, your health, the facility and your surgeon/anaesthetist. Ask what is planned and why.
Benefits
- Can greatly reduce, and for many people remove, the everyday need for glasses or contact lenses for distance vision
- Suitable for many people whose corneas are too thin, or prescriptions too strong, for laser surgery
- Does not remove corneal tissue, and can in principle be removed or exchanged
- Quick visual recovery for many people, often within a day or two
- Can give very sharp distance vision in suitable eyes, including strong prescriptions
Risks & complications
- Mild soreness, watering or light sensitivity for the first days
- Glare, haloes or starbursts around lights, especially at night, often improving over weeks
- A short-term rise in eye pressure soon after surgery, usually managed with drops
- Blurry or fluctuating vision while the eye settles
- The lens sitting too high or too low (incorrect 'vault'), sometimes needing the lens to be exchanged
- Raised eye pressure that needs treatment, or pressure spikes if the lens crowds the eye's drainage
- A toric lens rotating out of position and needing repositioning
- Gradual loss of the cornea's inner cells (endothelial cells), which needs lifelong monitoring
- Cataract forming in your own natural lens, sometimes needing later cataract surgery
- Infection inside the eye (endophthalmitis), which is sight-threatening and needs urgent treatment
- Significant inner-cell loss leading, in the long term, to needing a corneal transplant
- Retinal detachment, more of a background risk in very short-sighted eyes
- Serious, lasting reduction in vision
The risks that set ICL apart from laser are those of opening the eye and leaving an implant inside it: raised pressure, slow loss of the cornea's inner cells, cataract, and the rare but serious risk of infection inside the eye. The lens depth ('vault') matters — too high or too low can mean the lens is exchanged. Ask your surgeon about your inner-cell (endothelial) count, your personal risk of cataract and raised pressure, and how long the cornea will be monitored.
Published figures to discuss
Reported outcomes vary with the lens model, the surgeon and how long patients are followed, and many studies come from selected groups or device registries, so figures should be read cautiously. Modern central-hole lenses report lower rates of cataract and inner-cell loss than older designs, but inside-the-eye risks remain and the cornea needs lifelong monitoring; the long-term effects beyond several years are still being established.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Cataract in your own natural lens | Low with modern central-hole lenses (often well under 1% in early years), but higher over longer follow-up and with older lens designs | Older studies reported cataract changes building up over 5–10 years; this is why your own lens is monitored over time. | Implantable phakic contact lens — systematic review (PMC)pmc.ncbi.nlm.nih.govPublished figure |
| Loss of the cornea's inner (endothelial) cells | Around 0.5% at 5 years for modern lenses in some series, with older designs reporting roughly 5% at 10 years | Usually not a problem, but significant loss can, rarely, lead to needing a corneal transplant; lifelong monitoring is needed. | Implantable phakic contact lens — systematic review (PMC)pmc.ncbi.nlm.nih.govPublished figure |
| Lens exchange for wrong vault (sitting too high or low) | Uncommon; reported in well under 1% in some series | Correct lens sizing reduces this; a poorly vaulting lens may crowd the eye's drainage or touch the natural lens. | Implantable phakic contact lens — systematic review (PMC)pmc.ncbi.nlm.nih.govPublished figure |
| Infection inside the eye (endophthalmitis) | Rare, as with other intraocular surgery | Sight-threatening and needs urgent treatment; robust single percentages are not reliable, so this is qualitative. | Implantable phakic contact lens — systematic review (PMC)pmc.ncbi.nlm.nih.govSource-linked context |
These are literature figures, not a personalised prediction. Your own risks and likely benefits depend on your circumstances, your health, and how your care is carried out and followed up.
Recovery — what to expect, and when
Recovery is often quick for vision — many people see well within a day or two — but the eye still needs careful aftercare because an implant is now inside it. Eye pressure is checked early, and the cornea's inner cells need monitoring for the long term.
- A gritty, watery, light-sensitive eye for the first few days
- Hazy or fluctuating vision that improves over days to weeks
- Haloes or starbursts around lights, often most noticeable at night, easing over weeks
- Needing to use several different drops for a few weeks
- Vision being sharper on some days than others while it settles
Aftercare
- Use all prescribed drops (antibiotic, anti-inflammatory and any pressure-lowering) exactly as directed.
- Do not rub or press the eye, and wear any protective shield when sleeping as advised.
- Avoid swimming pools, hot tubs, dusty environments and eye make-up for the advised period.
- Avoid strenuous activity and heavy lifting in the early weeks.
- Attend the early pressure check, as a rise in eye pressure is common soon after surgery.
- Do not drive until your vision clearly meets the legal standard and your surgeon agrees.
- Keep long-term review appointments to monitor pressure, lens position and the cornea's inner cells.
- Lift home and help for the first day or two arranged
- All prescribed drops collected and a dosing plan understood
- Protective eye shield ready for sleeping
- Early pressure-check appointment booked
- Time off booked (often a few days to a week)
- Long-term review plan understood
- Clinic's urgent/out-of-hours number saved in case of pain, pressure or vision change
⚠ Get urgent help if…
- Severe or increasing eye pain, or pain with nausea or vomiting (possible dangerously raised pressure)
- Sudden drop in vision, or vision getting worse rather than better
- Growing redness, light sensitivity or discharge (possible infection inside the eye — an emergency)
- A sudden shower of new floaters, flashing lights or a shadow/curtain across vision (possible retinal detachment)
- Severe haloes or glare that are worsening rather than settling
- Any of these should prompt immediate contact with your clinic or urgent eye care
Who to contact: your surgeon or clinic first (keep their number to hand). For urgent advice when you can't reach them, call NHS 111. In an emergency, call 999.
General guidance — it doesn't replace the specific advice your surgeon gives you.
Results & realistic expectations
A good result means clear distance vision with much less reliance on glasses or contact lenses, often very sharp even in strong prescriptions, reached within days to a few weeks. Most suitable eyes achieve excellent unaided distance vision, but a minority are slightly over- or under-corrected and may still need glasses for some tasks.
An ICL does not stop the eye ageing. You keep your own natural lens, so reading glasses are still needed from the mid-40s and cataract can still develop later. It also does not prevent glaucoma or retinal problems, so lifelong eye checks remain important.
An ICL is designed to stay in the eye long term and the correction is usually stable. However, because your own natural lens remains, you will still develop age-related reading difficulty (presbyopia) and may develop cataract — at which point the ICL is removed and cataract surgery performed. The cornea's inner cells slowly reduce over the years and need monitoring, as significant loss can, rarely, require a corneal transplant.
Combining with other procedures
Both eyes may be treated on the same day or a few days apart depending on the surgeon. An ICL is sometimes discussed alongside laser surgery or, in older patients, lens replacement; the right choice depends on your eye anatomy and age rather than a marketed package. If you later need cataract surgery, the ICL is removed at the same time.
Follow-up & long-term care
You should be seen within the first day or so to check eye pressure, then over the following weeks to confirm the lens position (vault) and vision. Long-term, you need regular checks of pressure, lens position and the cornea's inner-cell count for as long as the lens is in place. Good clinics build this lifelong monitoring into the plan from the start. Report pain, pressure symptoms or worsening vision immediately.
- Attend regular long-term reviews of eye pressure, lens position and the cornea's inner-cell (endothelial) count.
- Continue routine sight tests and eye-health checks with an optometrist.
- Be alert to cataract developing in your own lens over the years.
- Expect to need reading glasses from your mid-40s, as your natural lens still ages.
- Keep records of the lens type and power for any future eye care.
Revision and secondary surgery reality
- The lens can be repositioned or exchanged if it sits at the wrong depth (vault) or a toric lens rotates.
- Some over- or under-correction may be managed with glasses, or occasionally a laser top-up, rather than swapping the lens.
- If cataract develops later, the ICL is removed and standard cataract surgery is performed.
- Significant loss of the cornea's inner cells can, rarely, require a corneal transplant.
Ask your surgeon for their own revision rate, what counts as a revision, and what is included in the written aftercare policy.
What good aftercare looks like
- An early eye-pressure check, as pressure can rise soon after surgery.
- A named contact route and written instructions on urgent signs (severe pain, pressure, vision loss, flashes/floaters).
- Confirmation of the lens position (vault) once the eye has settled.
- A clear, lifelong monitoring plan for pressure, lens position and the cornea's inner cells.
- Honest advice that your natural lens still ages, so reading glasses and possible cataract surgery lie ahead.
What affects the cost
Costs vary a great deal between people and providers, and we don't publish prices. What matters is understanding what drives the cost and making sure your quote is complete. The main things that affect it:
- The type and power of lens, including whether it corrects astigmatism (toric)
- Your prescription strength and how complex your eyes are to assess
- Whether a preliminary laser hole in the iris is needed
- The surgeon's experience and seniority
- Whether the assessment, both eyes, follow-up appointments and long-term monitoring are included
- The clinic and facility fees, and whether a clear policy for complications or lens exchange is included
- Whether the full suitability assessment is included or charged separately
- Whether the price covers both eyes and the lenses themselves
- Whether any preliminary procedure (such as an iris laser) is included
- Whether all follow-up appointments and long-term monitoring are included
- What happens, and what it costs, if the lens needs repositioning or exchanging
- The named operating surgeon
- What happens, and what it costs, if there is a complication such as raised pressure or infection
On the NHS? Implantable contact lenses to reduce dependence on glasses or contact lenses are not normally funded by the NHS and are an elective, self-funded procedure; the NHS treats eye disease rather than lifestyle vision correction.
You're entitled to your total cost in writing — including aftercare and any revision — before you decide.
Consent traps and marketing red flags
These are not small details. They are often where patients lose choice, time to reflect, or realistic expectations.
Consent traps
- No measurement or discussion of the cornea's inner-cell (endothelial) count.
- No explanation that you keep your natural lens, so reading glasses and possible cataract still lie ahead.
- No clear plan for lifelong monitoring of pressure, lens position and the cornea.
- Down-playing the inside-the-eye risks (pressure, cataract, rare infection) compared with laser.
- Time-limited discounts or pressure that rush the decision, or not knowing who will operate.
Marketing red flags
- 'Permanent perfect vision' or 'better than laser for everyone' claims.
- 'Without risks' or 'reversible so nothing to worry about' language that ignores inside-the-eye risks.
- No mention of inner-cell monitoring, cataract risk or raised pressure.
- Headline prices that hide the assessment, lenses, follow-up or long-term monitoring.
- Limited-time offers or hard-sell tactics pushing a quick decision.
Choosing a surgeon safely
- Check your surgeon is on the GMC Specialist Register for this area.
- Make sure they practise at a CQC-registered location, and look for membership of bodies like BAAPS or BAPRAS.
- You're entitled to a two-stage consent process with time to reflect (a cooling-off period). The surgeon who will operate must consent you — not a salesperson.
- Be wary of pressure: time-limited offers, discounts or deposits taken before you've had time to think are red flags, not bargains.
- You're entitled to your total cost in writing — including aftercare and any revision — before you decide.
Questions to ask your medical professional
Take this to your consultation. A good surgeon will welcome every one of these.
- Given my prescription and corneal thickness, is an ICL better for me than laser or lens replacement?
- What is my cornea's inner-cell (endothelial) count, and what is my personal risk of cataract and raised pressure?
- How will you choose the lens size, and what happens if the vault is too high or too low?
- What result can I realistically expect, and what happens if I am over- or under-corrected?
- What is your long-term monitoring plan for pressure, lens position and the cornea?
- Who will perform my surgery, and who do I contact urgently for pain, pressure or vision change?
- Are you on the GMC Specialist Register for this area, and which Royal College or professional body are you a member of?
- Will you be the surgeon who carries out my operation, and who looks after me afterwards?
- What are the risks for someone like me, and how often do your own patients have a problem or need it repeated or redone?
- What does a realistic result look like — and what can this operation not achieve?
- What are my options, including waiting, doing nothing for now, or choosing a different approach?
- Can I have written information, results and aftercare instructions in a format I can use, including any accessibility or communication support I need?
- What is the total cost in writing, including any follow-ups, and how much time do I have to decide?
Frequently asked questions
Is an ICL available on the NHS?
How is an ICL different from laser eye surgery?
Can the lens be removed if needed?
Will I feel the lens in my eye?
Will I never need glasses again?
Why does the cornea need lifelong checks?
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How we made this page
Medically reviewed by a GMC-registered consultant. Written in plain English, checked against NHS, NICE, GMC and relevant Royal College / specialist-society guidance, and kept under review. No clinic paid to appear on this page, and we publish no pricing. This is general information to help you prepare — it is not a substitute for advice from your own clinician. How we review our guides →
Source hierarchy: UK regulator and NHS/NICE guidance first, then relevant Royal College or specialist-society guidance, then peer-reviewed evidence for procedure-specific figures where available.
Sources & standards: NHS — Laser eye surgery and lens surgery Royal College of Ophthalmologists — Refractive surgery (patient information) Royal College of Ophthalmologists — Professional Standards for Refractive Surgery (2024) Implantable phakic contact lens — systematic review (PMC) Endothelial cell loss after implantable collamer lens (V4c) — meta-analysis (PubMed) GMC — Cosmetic interventions guidance CQC — Care Quality Commission (England) Healthcare Improvement Scotland — independent healthcare regulation Healthcare Inspectorate Wales RQIA — Regulation and Quality Improvement Authority (Northern Ireland)
Reviews reflect patients' experience of care, not clinical outcomes. For procedure volumes and outcome data see PHIN.
Last medically reviewed 2026-09-21. Spotted something wrong or out of date? Report an error in this guide.
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