Choosing your cataract implant: the 5 questions to ask yourself before the consultation
“Doctor, which is the top-of-the-range implant?” It is the most common question before cataract surgery — and the one with the least clear answer. No implant is superior to the others in absolute terms: there are families of implants, each with its trade-offs, and there is an implant that matches your eye, your daily life and your tolerance. The useful question is therefore not “which one tops the ranking?” but “which one fits me?”. Here are the five questions that decide the matter in consultation — and what the most recent studies actually say.
UNDERSTAND
A matter of trade-offs, not of rankings
An intraocular implant is the artificial lens that replaces the natural lens once it has become clouded, during the procedure. Choosing one is closer to choosing a vehicle than to reading a league table: an off-roader and a touring saloon are each excellent for their own use, and disappointing outside it.
The reason is optical, and it is simple. A young natural lens changes shape to focus from infinity down to the page of a book: that is accommodation. No implant available today reproduces this mechanism. To widen the range of sharp vision, the focal point must therefore either be stretched or split — and in both cases the available light is distributed differently. Whatever is gained in comfort without glasses is paid for with a share of image quality or of night-time comfort. No implant is ideal for everyone, because this trade-off has no single solution: it depends on who you are.
This is why the preoperative consultation is not about running through a catalogue, but about understanding your daily life: working distances, night driving, hobbies, visual demands at work, tolerance of minor discomfort. The different families of premium implants are described in detail on their dedicated page; the article you are reading is about the decision, not about the catalogue.
The implant families at a glance
Three main families share the field of cataract surgery, alongside one cross-cutting option, the toric implant, which corrects astigmatism and can be combined with any of them.
| Family | Vision without glasses | Strength | Trade-off |
|---|---|---|---|
| Monofocal | Distance | Image quality and contrast — the benchmark | Glasses for intermediate and reading |
| EDOF | Distance → intermediate | Continuous vision out to the screen and the dashboard | Backup glasses for prolonged reading |
| Multifocal (trifocal) | Distance, intermediate, near | The highest rate of independence from glasses | Night-time halos possible, contrast slightly reduced |
| Toric (option) | Depends on the family it is combined with | Corrects corneal astigmatism | Requires a regular cornea and stable positioning |
Where each family places sharp vision
The monofocal concentrates all the light on a single focal point. The EDOF stretches that focal point. The trifocal splits it into three distinct zones — hence reading without glasses, and hence the halos.
Monofocalone focal point
EDOFstretched focal point
Trifocalthree focal points
Schematic diagram: the width and position of the zones illustrate an optical principle, they do not represent a measurement. The actual range depends on the implant model, on your eye and on the refractive outcome achieved.
Each family has its own page: the EDOF implant, the trifocal multifocal implant and the toric implant are set out there model by model. Above all, remember the logic: the more sharp distances an implant is asked to deliver, the more it is asked to share out the light.
What about the “enhanced” monofocal?
An intermediate category has grown up in recent years: so-called enhanced monofocals, or mono plus, meant to add a little intermediate vision without the trade-offs of a premium implant. A meta-analysis of defocus curves covering 36 studies compared these implants with standard monofocals: at 66 cm as at 40 cm, performance proved comparable, while EDOF lenses did better at both distances (Srinivasan et al., BMJ Open Ophthalmology, 2025). In other words, the announced gain in intermediate vision was not found in the pooled data — a useful point to know if this type of implant is offered to you as a middle-ground compromise.
What the studies say — and where they diverge
On independence from glasses, the data converge and are solid. A meta-analysis of 21 randomised trials totalling 2,951 patients finds that, with a multifocal implant, the probability of doing without glasses entirely is 2.9 times higher than with a monofocal (Cao et al., Survey of Ophthalmology, 2019). A more recent review comparing EDOF and trifocal implants likewise finds greater spectacle independence and better near vision with the trifocal (Karam et al., American Journal of Ophthalmology, 2023). On this point the message is clear.
On halos, by contrast, the literature is not unanimous — and it would be dishonest to present you with a consensus that does not exist. The same 2019 meta-analysis finds a risk of halos roughly three times higher with a multifocal, along with slightly reduced contrast sensitivity. But a network meta-analysis published in JAMA Ophthalmology, which pooled 27 trials and 2,605 patients, finds no statistically significant difference between multifocal and monofocal implants for contrast sensitivity, glare and halos (Cho et al., 2022). Nor does the EDOF versus trifocal comparison show any significant difference on halos (Karam et al., 2023).
Survey of Ophthalmology · 2019
Cao et al. · meta-analysis of 21 randomised trials · 2,951 patients
Halos about 3 times more frequent with a multifocal implant, and contrast sensitivity slightly reduced.
JAMA Ophthalmology · 2022
Cho et al. · network meta-analysis of 27 trials · 2,605 patients
No statistically significant difference between multifocal and monofocal implants for halos, glare and contrast sensitivity.
Two serious meta-analyses, the same question, two answers. That is exactly why no one can promise you that halos will not occur, nor tell you in advance that they will.
How can this gap be explained? Mainly by what is measured, and on which implants. Photic phenomena are collected sometimes by questionnaire, sometimes by a simple yes/no answer, with thresholds of discomfort that differ widely from one study to another. The generations of implants differ too: the oldest work concerns diffractive bifocals of an earlier generation. The reasonable reading is therefore this: halos are a real phenomenon, common in the early stages with a diffractive implant, whose intensity and persistence vary a great deal from one person to another — and neither a systematic phenomenon nor a negligible one.
Two further readings to take this further: what an EDOF implant actually changes about night halos, and the question of independence from glasses after 60 with a multifocal.
The 5 questions to ask yourself before the consultation
The examinations in the preoperative assessment say what your eye allows. These five questions say what you want — and it is your answers, more than any implant’s specification sheet, that decide. They are best prepared quietly at home, before coming in to discuss them.
1. Would wearing reading glasses really bother you?
Answer honestly, without second-guessing the reply you think is expected. If putting on glasses to read feels natural to you, a monofocal or an EDOF avoids introducing optical trade-offs you do not need. If the idea of hunting for your glasses to read a message, a price tag in a shop or the time is genuinely irritating, the discussion moves towards a trifocal or a monovision strategy. There is no right answer — only yours.
2. Does night driving play an important part in your life?
Frequent night driving, driving for a living, or driving in poorly lit rural areas: this is the profile in which the halos of a diffractive implant weigh heaviest. An EDOF, a monofocal or a toric monofocal is often the wiser option here. The question to ask head-on is this: are you willing to see halos around headlights if it frees you from glasses? Some answer yes without hesitating, others no — and both answers are legitimate.
3. Have you ever tried monovision?
Monovision means setting one eye for distance and the other slightly for near; the brain combines the two. If you have already experienced it with contact lenses and tolerated it well, reproducing it surgically is a reliable option, one that avoids the trade-offs of a diffractive implant. Without prior experience, it is offered cautiously: adaptation is not universal, and a mini-monovision (a reduced difference between the two eyes) is then preferred to a full monovision.
4. Does your activity demand extreme visual precision?
Some occupations and some passions place image quality above everything else: work on micro-detail, watchmaking, demanding graphic arts, target shooting, astronomical observation. For these profiles, the monofocal — toric if there is astigmatism — remains the safest option. The monofocal is never a consolation prize: it is the implant that restores the most faithful optical quality, at the price of reading glasses.
5. How do you react to small imperfections?
An unusual question in consultation, and yet one of the most predictive. Someone very attentive to the slightest flaw will find the halos of a diffractive implant hard to live with, even after an excellent surgical result; a more easy-going personality will have forgotten them within a few weeks. Neuroadaptation — the work the brain does as it learns to ignore light artefacts — generally takes a few weeks to a few months, and it comes more easily to those who are not paying attention to it all the time. Honesty in this self-assessment counts as much as the biometry.
Does it have to be the same implant in both eyes?
No, and there is a recognised strategy for this, known as mix-and-match: a trifocal in one eye, an EDOF in the other, with the idea of combining the near vision of the first and the night-time comfort of the second. A 2026 systematic review pooled five studies and 225 patients: the uncorrected binocular vision achieved at three months was satisfactory at distance, at intermediate and at near (Rakhimova et al., Medicina, 2026).
Caution is nonetheless required, and the authors say so themselves: the certainty of the evidence is rated very low, heterogeneity between studies is substantial, and follow-up does not go beyond three months. This work measures visual acuity, not long-term satisfaction or tolerance of halos. Mix-and-match is therefore a reasonable option to be discussed case by case, not a default recommendation.
When the eye dictates the answer
Your preferences guide the choice, but they do not override anatomy. Some situations reduce the value of a diffractive implant, or rule it out altogether: maculopathy, notably age-related macular degeneration (AMD), advanced glaucoma with damage to the central visual field, an irregular cornea or keratoconus, severe uncontrolled dry eye, a history of refractive surgery with significant aberrations. The subject is developed in a dedicated article: multifocal implant with AMD or glaucoma.
This is precisely the role of the preoperative examinations — biometry, corneal topography, macular OCT, pupil diameter measurement — to document these limits beforehand, and not afterwards. A premium implant that is well indicated brings real comfort; the same implant in a poorly selected candidate creates lasting discomfort.
How is it covered in France?
Cataract surgery with a monofocal implant is covered by the French national health insurance (Assurance Maladie) as part of the standard care pathway. Premium implants — EDOF, multifocal, toric — involve a supplement that is not reimbursed by the social security system, varying with the technology, and sometimes partly covered by certain complementary health insurance policies. The details are set out on the cataract surgery pricing page, and a written quote is given to you before any decision: no choice is made without your knowing its exact cost.
DR TOURABALY’S PERSPECTIVE
How the decision is made, and where the procedure takes place
The consultation and the preoperative assessment take place at the Cachan practice. The discussion always follows the same order: first what your eye allows, then what you want, and finally the cost of each option. You leave with an explicit choice and the reasons behind it — never with an implant imposed on you.
The procedure itself is carried out at the Clinique Sainte-Geneviève (29 rue Sarrette, 75014 Paris), as a day case. The surgical technique — phacoemulsification — is the same whichever implant is chosen: only the lens inserted at the end of the procedure differs. Bring your examination reports if you have them, and your questions: the soundest decisions are the ones that have been prepared on both sides.
Sources
- Cho JY et al. “Visual Outcomes and Optical Quality of Accommodative, Multifocal, Extended Depth-of-Focus, and Monofocal Intraocular Lenses in Presbyopia-Correcting Cataract Surgery: A Systematic Review and Bayesian Network Meta-analysis”, JAMA Ophthalmology, 2022. PMID 36136323
- Karam M et al. “Extended Depth of Focus Versus Trifocal for Intraocular Lens Implantation: An Updated Systematic Review and Meta-Analysis”, American Journal of Ophthalmology, 2023. PMID 36736751
- Cao K et al. “Multifocal versus monofocal intraocular lenses for age-related cataract patients: a system review and meta-analysis based on randomized controlled trials”, Survey of Ophthalmology, 2019. PMID 30849425
- Srinivasan S et al. “Meta-analysis of defocus curves of monofocal, enhanced monofocal and extended depth of focus IOLs”, BMJ Open Ophthalmology, 2025. PMID 40903089 — note: three of the four authors are employed by an implant manufacturer.
- Rakhimova M et al. “Visual Outcomes After Mix-and-Match Implantation of Trifocal and Extended Depth-of-Focus Intraocular Lenses: A Systematic Review and Meta-Analysis”, Medicina, 2026. PMID 42356124 — certainty of the evidence rated very low by the authors.
Is there a “best” cataract implant?
No, and the question deserves to be reframed. Each family of implants sets the cursor differently between image quality and breadth of sharp vision. The monofocal restores the most faithful contrast but requires reading glasses; the trifocal offers the greatest independence but exposes you more to halos; the EDOF sits between the two. The relevant implant is the one that matches your eye and your way of life.
Can an implant be changed after surgery?
An implant exchange is technically feasible, but it is a further operation, with risks of its own. It remains rare when preoperative selection has been rigorous and the trade-offs have been explained beforehand. It is precisely in order to avoid this situation that the assessment and the initial discussion are so detailed.
Are multifocal implants suitable for everyone?
No. Several situations lead to setting them aside or to using them with caution: maculopathy such as AMD, advanced glaucoma with damage to the central visual field, an irregular cornea or keratoconus, severe uncontrolled dry eye, a history of refractive surgery with significant aberrations, or certain occupational demands. The preoperative assessment — corneal topography, macular OCT, pupil measurement — makes it possible to determine this before surgery.
Does an implant wear out over time?
No, intraocular implants are designed to stay in place for life and do not degrade. What can happen, in the months or years that follow, is a clouding of the capsule that holds the implant: this is what is known as secondary cataract, treated in consultation with a YAG laser capsulotomy.
Can two different implants be used, one in each eye?
Yes, this is the strategy known as mix-and-match, most often a trifocal in one eye and an EDOF in the other. A 2026 systematic review covering five studies and 225 patients reports satisfactory binocular vision at all distances at three months, but with a certainty of the evidence rated very low by the authors themselves. It is an option to be discussed case by case, not a default solution.
Is the operation the same whichever implant is chosen?
Yes. The surgical technique, phacoemulsification, is identical: the same incision, the same removal of the clouded natural lens. Only the lens inserted at the end of the procedure differs. The choice of implant changes neither the length of the operation, nor how it unfolds, nor the usual recovery.
How long does it take to get used to a multifocal implant?
Neuroadaptation — the process by which the brain learns to favour the useful image and to ignore light artefacts — generally takes a few weeks to a few months. Halos around headlights are most often at their strongest in the first weeks, then fade. This adaptation varies from one person to another, which is why individual tolerance of imperfections counts as much as the technical data when making the choice.
Cachan practice · Tel. +33 1 45 47 08 11
Patient journey: your cataract surgery step by step
Written and reviewed by Dr Moïse Tourabaly, ophthalmic refractive surgeon — former chef de clinique (Quinze-Vingts National Eye Hospital).
Last updated: September 14, 2026
