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Multifocal implant

Multifocal implant: definition

A multifocal implant is an implant to several homes, to correct over a distance of vision after cataract surgery (ex: distance vision, vision for bifocal implants, and intermediate vision plus with trifocals implants which tend to become the benchmark for multifocalite). Multifocal implants are available in order to make operation of cataract patients independence to the correction in glasses for distance vision and the close (bifocal implant) vision, distance vision and intermediate vision (implant to "depth of field"), or the three distances (trifocal implant). They stand so implants called "monofocal", which are equipped with a monofocal lens and allow either to see from a distance, to see up close without glasses (on the) power selected for the implantWe can correct a myopia or hyperopia preoperative, or let a low myopia for reading without glasses).

There are mainly two types of multifocal implants: refractive and Diffractive. They are designed to be implanted bilaterally in most common indications.

Refractive and Diffractive multifocal implant

The insertion of a multifocal implant may be offered to patients who wish to no longer wear glasses in vision from far and near, knowing that the distance of the vision of '' close '' is the distance used by the patient to read a book (usually 30 to 45 cm). The consultation of digital screens (computers and tablets) can be accomplished at a slightly greater distance (60-80 cm). Multifocal implants have an optical design designed to separate the light refracted by the implant to two majority homes: one for distance vision and the other for vision closely, and possibly a third for the intermediate vision (trifocals). They can be of type refractive (depth of field especially implants) or (Diffractive)BI and trifocals, implants to depth of field).

Then, some refractive multifocal implants offer a depth of useful field covering vision from afar, from near and intermediate vision. They are equipped with a perspective where the refractive power variations are spread over different areas (the intermediate vision is provided by the 'junction' between the areas dedicated to the home from far and near). These areas can be concentric or not. THEstudy aberrometrique of the multifocalite of refractive multifocal implants is particularly instructive.

"Diffractive" multifocal implants are Bifocal or trifocals. Bifocal implants generate additional shelter close in addition to the home by far, but not a real home for the intermediate vision, only trifocals implants provide (ex; FineVision, B.j. implant). They are designed as an addition to a monofocal refractive lens of a Diffractive network of type kinoforme.  This somewhat technical term refers to a structure that looks somewhat similar to the "steps", and it is this network that makes sharing light between different homes, a little like a deflector for aeration allows you to split a stream of air in several directions in the passenger compartment of a vehicle. All Diffractive implants have at least part of their surface a Diffractive network: Restor implant, implant ATlisa, Tecnis multifocal, Finevision, and Symfony (this last representing a Diffractive implant for distance vision and the intermediate vision, homeless for near vision).

Diffractive implants are designed to exploit certain physical properties of the visible light spectrum: their specificity towards conventional monofocal and multifocal implants refractive lies in the ability granted by a diffractive of structure separate light energy into various distinct homes.

The realization of a diffractive Optics is an elegant solution to the challenge that represents a multifocal lens design to reduce dependence on the optical correction in glasses of the patients operated for cataract.


network Diffractive implant

Schematic representation of a Diffractive implant, which is made up of a monofocal lens with a Diffractive network (kinoforme). The network allows to split part of the incident light energy to a home (here; vergence = + 4 D). The rest of the energy is not diverted (if the network is joined on a monofocal lens, this not deflected energy is focused to the home of the monofocal optical)

Diffractive IOL

Homes of a Diffractive bifocal implant: note the circle of dissemination between homes close (red) and far (green).



Multifocal implants: optical effects

It is conventional to state that multifocal implants allowing the simultaneous focus of at least two images on the retina (far and near), and that they impose the patient to "extract" the image useful according to the context. Thus, the ability of the subject to perform this tri-cortical (choice of the image) would be one of the keys to the success of implantation of Multifocal lenses. In reality, this design is completely wrong because too simplistic: the look is only about an object (remote, or near) both!

Thus, there is no "choice of vision" to do for each eye surgery, but the vision in each eye will be net less net (or contrasting) depending on the quality of focus achieved with the implant. Sharing the light in several homes is potentially a reduction of the vision of the contrasts in distance vision and can induce the perception of parasitic light phenomena as the night-time halos goshawks of the light bright.  These halos are circular, and don't prevent that rarely drive at night. Some optical designs, like the apodisation, to reduce the perception of luminous halos. Bifocal implant Restor (Alcon) and the trifocal implant FineVision (B.j.) are apodisés; the diffractive pattern is dimmed to the edges of the implant (markets are less and less high as they are close to edges; less light is diffracted to the home closely). When the pupil is dilated, the proportion of light diffracted to the home by far proportionally with the pupillary opening, allowing to reduce the risk of luminous halos.

Similarly, the refractive requirement for these implants is great: the calculation of the power of the implant (for far vision) must be done very precisely. Despite this, a biometric calculation error can occur, and can then be corrected by a corneal refractive surgery as needed (or change your implant, which is more invasive in most situations).

He must inform the patient in preoperative of these contingencies.

Indications of multifocal implants

If these multifocal implants are initially discouraged in patients who perform mainly visually demanding activities such as driving at night, the Visual phenomena that they induce are most often well tolerated.

Multifocal implants represent an attractive alternative to patients before all eager to not wear glasses after surgery to see far and close but also in intermediate vision (screens dashboards, etc), including with trifocals implants. Besides, there is no contraindication to the placement of an implant trifocal when the indication of a bifocal implant has been asked, unless the patient does not wish to take advantage of the intermediate vision without correction.

We get good functional results with multifocal implants provided you follow certain indications as the correction (prior or joint surgery of cataract) a astigmatism corneal more of a diopter adjustment, and a precise biometric calculation. Near useful vision is between 30 and 45 cm. The intermediate vision (trifocal implant) is located between 65 cm and 80 cm. With trifocals implants, there is a mixture of sharp vision between reading vision and far vision.

Reading without glasses is possible but requires most of the time a good lighting (it is much more difficult to read in dim light).

The implants to "depth of field" (ex: Oculentis, refractive implant, or Symfony, Diffractive implant) are characterized by a vision almost smaller than for trifocals implants (the energy allocated to the home for the vision of close is zero or low). They cater to patients who do not necessarily wish to dispense with glasses for reading, but simply to be able to read at distance of intermediate vision a digital screen, or even a text manuscript including the font is not too fine.

The following video is dedicated to the links between aberrations, contrast, depth of field of accommodatifs and multifocal implants:

Between 2008 and 2010, I participated in the design and the filing of the patent of the first implant «» trifocal", designed to improve the quality of the intermediate vision (60 to 75 cm), which is often the weak point of the diffractive bifocal implants. This implant trifocal, known as' Finevision'® (B.j. laboratories) was initially available exclusively to the Rothschild Foundation, and was introduced on the market in the fourth quarter of 2010. There are today in o-ring version (for simultaneous correction of astigmatism).

Another trifocal Diffractive implant (Tri ATLisa) is also available, and was introduced on the European market some months after the implant FineVision.

The following video describes the principles involved and the explanations concerning the design of a Diffractive multifocal implant:


This video explains the basics of the design of a diffractive Optics (Diffractive multifocal implant):


More information here:

Link to the project pages on the site CÉROC : explanations on the principles at stake for the Diffractive optics.


More documentation (multifocal implants, including Diffractive trifocal)

FineVision brochure

CRS Today, Supplement, Nov 2010, trifocal IOL B.j. Dr. Gatinel

RSPC, Trifocal, Dr. Gatinel Supplement Nov 2010, en


Download "Vision and multifocal Implants."

Download "Fundamental for multifocal Implants"

Download Article "Measures Objectives of quality optics of multifocal Implants".

Download Article "can you implement a contact multifocal intraocular lens after refractive surgery?

38 responses to "multifocal implant"

  1. of Saint Germain says:

    50 years old with a myopia of more than 10 diopters, I have to have cataract surgery. After a first consultation where I am offered an implant that would leave me 3 diopters, I was interested in your work on the multifocal Finevision implants that I read with great interest and which seem to me to be a solution to my visual problems.
    I would like you to advise me on a list of ophthalmologist on Toulouse that are working on this type of implant.
    Thanking you in advance for the attention you will bear to my message,
    Please accept, doctor, my respectful greetings.

  2. Dr. Damien Gatinel says:

    Multifocal implants can be considered in the myopic strong, but this is not their best indication, for various reasons, some of which are due to the "fragility" of strong myopic eyes, especially at the retinal level. In general, it is proposed to leave a slight myopia, and this often provides an objective and subjective result that is quite positive in myopic patients.

  3. Mesnil says:

    Hello, is it normal to have always the impression of having like a tear in the eye after the installation of a multifocal implant "Panoptix toric"? The other eye has another implant.. Operation made 5 months ago.. Thank you for your reply

  4. Dr. Damien Gatinel says:

    This feeling of tear is not normal, a detailed opthalmologique examination should allow to understand the why of this sensation that affects only an eye in your case...

  5. Xavier says:

    Hello, I am assigned a capsular bilateral cataract at the age of 37 years. This cataract is very advanced according to my ophthalmologist. She has me in many conditions but I can live almost without glasses including working on screen (my job). are trifocal implants a solution? I am afraid that the benefit/risk ratio is not so favorable in particular for driving at night.

  6. Dr. Damien Gatinel says:

    Trifocal implants are a potentially interesting solution for replacing a Crystalline lens with cataracts in patients who do not wish to wear glasses. This indication must be weighted against the degree of cataract and discomfort felt. In many case, cataract-induced halos are much more intense than those caused by trifocal implants, so patients with a real cataract and anxious not to depend on glasses are satisfied with The intervention and do not present any special complaints in night vision.

  7. Desmiez says:

    Hello, I am 59 years old and I have already operated the Lazik 14 years ago, today I am still astigmatism hyperopic and very longsighted (my brother had cataract surgery at 59 years and my parents also had cataract surgery before 65 years) , I met a surgeon who advises me of trifocal implants and another who advises me to remake the laser to refresh my eyesight because he thinks that the multi or trifocal implants after a Lasik, there are many errors in implant calculations, and a high quality Vision that is less good after a Lazik
    What do you think
    Thanking you for your response

  8. Dr. Damien Gatinel says:

    It is indeed prudent to re-consider the indication of trifocal implants in case of the history of LASIK, and certainly prefer to move towards a LASIK remodeling if it is possible. Multifocal implants have been designed using eye models for which the cornea has "standard" anatomical characteristics. Optical aberrations sometimes generated by corneal surgeries, if they are not bothersome in everyday life, can, however, compromise some of the effectiveness of multifocal implants.

  9. Descamps Bernadette says:

    Hello doctor,
    I am 66 years old, Hyperopic + 4d, posterior cortical cataract (corticosteroids) Vision 6 right with strong discomfort (10 a year ago with discomfort) + 8 left without discomfort. Am I eligible for tri-focal implants?
    About Nice and surrounding what surgeon can you advise me? OCT scheduled for April 25th.
    Thank you for the attention paid to my problem.

  10. Vincent says:


    I am 52 years old, a cataract on both eyes and the following current corrections (goggles) in myopia and astigmatism: OD-10.50 (-3.00 to 0 °) and OG:-11.50 (-3.50 to 0 °).

    My retina is in good condition, the glazed is already well taken off, no optic nerve problem, no macular problem, just a high strabismus and a bit of dry eye that prevents me from wearing lenses. After a test battery, my ophthalmologist proposes to operate cataracts and to put in each eye a "premium" multifocal implant.
    Does this indication appear "reasonable"?

    Thank you in advance for your answer.

  11. Dr. Damien Gatinel says:

    A priori, the strong hyperopia is a good indication to the cataract surgery with the installation of multifocal implants. I cannot explicitly cite names of confreres on this site, but ask for information and you will have the choice between several high quality surgeons for the break of this type of implants.

  12. Dr. Damien Gatinel says:

    The indication is not déraisonnalble but must be well calibrated. Strong myopia exposes certain retinal complications as you know. An alternative often as effective in short-sighted strong is a reduction to about 90% of the myopia of both eyes with monofocal implants, or even a monovision (rocking). It all depends on the condition of your retina. Strong Myopics are subjectivementsly thrilled when their postoperative myopia is reduced to less than 2 diopters. They keep a very good vision. With MF implants, close-up vision requires good lighting, which is sometimes a little ' disconcerting ' among myopic people accustomed to being able to read without any worries even very close...

  13. Vincent says:

    Thank you very much for that answer.

  14. David says:

    Hello doctor,

    Can you explain the difference between the multifocal implants refractive and diffractive?
    which are sensitive to the "decentralization" of the implant? And why is it the case?

    Another thing is that the O-rings are indicated up to what degree of astigmatism?

    Thanks in advance

  15. Hello
    I am going to have cataract surgery, but with one eye (left, acuity of 3/10 after correction); The right, has a acuity of 10/10 after correction. Moreover, it is probable that, at present, only this right eye will serve me for reading.
    My ophthalmologist proposes to me either a monofocal implant or a multifocal implant to avoid a correction by the port of bezel in vision of meadows. But if the intervention only takes place on one eye, will I actually be able to do without reading glasses? The vision then made essentially with the eye operated and no longer with the right eye that would not be corrected. Or it must be understood that there will certainly be no need for "external" correction for the left eye but a correction will remain necessary for the unoperated eye.
    Thanking you not advance for your answer
    Kind regards

  16. Dr. Damien Gatinel says:

    The unilateral implantation of a multifocal implant is possible, and allows in many case to provide the patient with a visual acuity of near uncorrected useful (to read in good lighting conditions). Of course, it is better to be operated bilaterally from a functional point of view, but you may have a cataract on the right side in the future. The correction of the right eye will remain unchanged, but if without glasses, your left eye is "effective" in close vision, then you could leave the right eye uncorrected for close vision.

  17. Dr. Damien Gatinel says:

    Refractive multifocal implants are equipped with "continuous" optical surfaces, the multifocal is driven by areas specifically dedicated to a given correction (e.g. vision from afar is at the centre, and close vision occupies a more crown Optical device). The currently posed refractive multifocal implants are designed to give vision from afar and intermediate vision, they are a little less efficient for close vision than diffractive implants.
    The diffractive implants allow to focus the light in different foci thanks to the principle of the diffraction of the light waves. There are repeated motifs on the surface of these implants (diffractive steps), the purpose of which is to create phase shifts of light waves specifically designed to interfere with light in specific foci. Currently, the majority of diffractive implants are trifocal, due to the importance of intermediate vision in modern life (screens, digital tablets, etc.). Diffractive implants were initially bifocal. The first trifocal implant was the FineVision implant (Physiol) and is still referenced today. Trifocal diffractive implants exist in an O-ring, and depending on the available ranges, it is possible to correct corneal astigmatism with a magnitude of up to 5 diopters.

  18. Slimani says:

    Hello, I am 48 years old and I am hyperopic.
    Currently I have a correction of 2.25 for the right eye and 2.50 for the left eye.
    I would like to no longer wear glasses, is there an operation and if so which to meet my expectations.

    Thanking you in advance.

    Kind regards

  19. Dr. Damien Gatinel says:

    In your situation (age, correction), LASIK is certainly the best technique to consider. Multifocal implant surgery is theoretically possible, but it is preferred to be performed in older patients, in whom a cataract begins.

  20. SHARON DOYERE says:

    Hello doctor,

    After cataract proved, and being hyperopic and moderately astigmatism, I saw a opthalmo that directs me to a Fine vision Micro F implant (trifocal) But having no information on this operation, I took another opinion that it directs me to implant Multfifocal 677 MY from Medicontur. Is this implant trifocal? Is it better than the Fine vision? Can I have full confidence? Post-operative discomfort (dry eyes, burns etc. Will it pass quickly?) I am 73 years old and no other affection of the eyes, I allow myself to come to you having seen that other people were asking questions, otherwise I do not know to whom to address Me. Thank you in advance for your valuable advice, I reside in the 04 and must have me operate in Marseille. In anticipation of your reply, receive doctor, my cordial greetings.

  21. Dr. Damien Gatinel says:

    I have experience only with the FineVision implant which is a reference trifocal. The local postoperative comfort is not related to the implant, and in general, recovery is Fast. Everything should go Well.

  22. ruegger maryse says:

    Hello doctor,

    I have 65 years, a myopia corrected by PUREVISION-2-multifocal lenses H right eye-6
    Left eye-4.75 and by glasses single focus vision by far right eye-8 left eye-5.5 (-050) 70 °. Good vision almost never needed glasses neither to read nor to work as well as a good intermediate vision. I have to have cataract surgery on Nov. 13 for the right eye and Nov. 27 for the left eye. I want to avoid a correction by wearing glasses for the vision of Meadows
    And be comfortable for far and intermediate vision as well as for driving at night.
    My ophthalmologist prescribed me for the surgery: Cataract Implants Rating OD 09.
    The orthoptist during the visit told me that with this implant I will have glasses for the vision of meadows. I am very anxious because this is not at all what I expect from this intervention.
    What type of implant can you advise me? I am not to whom else to address.
    The surgeon in this clinic does not receive the patients before the procedure.
    A big thank you for your answer and best regards

  23. Dr. Damien Gatinel says:

    The choice of the type of imlpant is an important time of the Préopéraotire cataract surgery balance sheet. Clear and loyal information must be given to the patient, and the possibility of using a multifocal implant exposed to the patient wanting to free themselves from the glasses in postoperative. There is no urgency to operate the cartaracte, and it is certainly opprotun that you can discuss the possibility of a multifocal implantation with your ophthalmologist. If the surgeon who needs surgery does not control the indications of the multifocal implants, you may take a second opinion elsewhere to verify your eligibility and receive detailed information that you are entitled to claim.

  24. I'm waiting for an appointment with the surgeon who needs cataract surgery. Among other flaws of vision, I see blurred two images with each eye (the second is I think called "Phantom".
    I am writing to tell you that I have read with great pleasure your didactics on implants.
    Thank you

  25. CAUCHIES says:

    Good evening
    My husband had surgery on 8 and 15 November 2018, he was placed multi-focal implants.. He sees well from afar and close, and his vision improves from day to day.
    However this morning he was on a control exam and was suggested a laser operation PKR in addition to his implants, supposedly that his vision from afar is not correct at 100%...
    I remain skeptical... because he did not complain of his vision from afar at this point. And I think it takes time for her eyes to adapt... (not even two months..) Could you advise me, because I think it is commercial abuse and not curative.. A big thank you

  26. Dr. Damien Gatinel says:

    There is no point in making a PKR to improve vision if your husband is satisfied with his vision from afar with the multifocal implants posed.

  27. Philippe says:

    Hello doctor
    I am 51 years old, a light cataract start and a presbyopia that evolves very quickly.
    I've been carrying contact lenses for over 30 years (rigid port extended the last 20 years).
    I do not have a problem of dry eye, I support very well my lenses to the point that I have never worn glasses for more than 30 years.
    My lens correction is as follows:-13.75 and-15.50.
    With lenses, my correction oscillates between 8.5 and 9/10.
    For more than six months, my presbyopia has become stronger, to the point that reading becomes very painful.
    I read your answers about the trifocal implants on the myopic strong.
    I have no concern for retina, but I have some floating bodies of glazed.
    I would like to benefit from trifocal implants and I would like to not have to wear glasses after laying.
    I'm not going to have to wear glasses when I've managed to get rid of them for over 30 years.
    Why should some of the uncorrected myopia be left out?
    Is that really necessary?
    What risks does the retina run?
    Is my willingness to want to pass completely glasses after 50 years a utopia?
    Thank you in advance for your answer.

  28. Dr. Damien Gatinel says:

    In my experience, short-sighted eyes must instead benefit from a monofocal implantation, inducing a slight myopia on both eyes or at least one eye to allow for an independent correction of close reading. The vision from afar will also be greatly improved. It is difficult to allow you to live totally without glasses, because some activities seek vision from afar, others very closely, and some patients are more demanding than others vis-à-vis their vision. In all case , if you have a cataract and a strong myopia, your condition can only be improved and the dependence on the glasses significantly reduced if not cancelled.

  29. Roxane says:

    Hello Dr.

    I have 54 years and myopia-8.50 and-7.50 plus astigmatism towards the-1.75 I think. I have the glazed off and some floating bodies. I'm made longsighted, too. I wanted to make the laser, but my cornea is too thin. They suggest to me the multifocal diffractive + 2.75. My retina is OK with a little old scar. They operate both eyes at the same time... As I have not seen my whole life, I am afraid of halos and complications because a friend not even myopic had a retinal detachment the year following the operation at 58 years old and my husband's fingernail now has glaucoma in an operated eye. I'm waiting to have cataracts in 20 years?

  30. DZUIRKA says:

    Hello doctor,

    I'm 55 years old.

    I was operated with an eye for a cataract with a monofocal implant for a vision from afar.
    Result: – 0.25 (-0.75 to 20 °) addition 2.75
    I'm wearing correctional glasses.
    I have to have surgery with the other eye:
    Correction before operation: + 0.25 (-0.75 to 15 °) add 2.50.

    I don't live wearing glasses.

    Does the installation of a multifocal implant, if possible, on the eye remaining to operate make sense for more autonomy without glasses?

    If so, could we then consider refractive surgery on the eye with a monofocal for more autonomy without glasses?

    Thanking you,

  31. Dr. Damien Gatinel says:

    Some patients tolerate and benefit from a unilateral multifocal implantation. This can allow reading without glasses, at least punctually, with good lighting. The eye already operated has a very slight myopia, which should only be punitive in low light conditions. Surgery could, if the vision from afar is considered unsatisfactory because of this myopia, correct this low myopia. It is often preferable to perform secondary refraction surgery of the cornea (LASIK or PKR) after cataract surgery and imperfect refractive result.

  32. Dr. Damien Gatinel says:

    You are indeed right to reconsider your indication. On the one hand, myopic strong eyes must be subjected to a cautious assessment, and are not always the "ideal candidates" for the surgery of Crystalline lens Clear with the installation of multifocal implants. The replacement of the Crystalline lens In a short-sighted young person without cataracts exposes to certain secondary complications, in the first place the retinal detachment. It is better to wait for a real beginner cataract, and to consider surgery with monofocal implants but with different power, to have an uncorrected vision over several distances (e.g. monovision).

  33. David L says:

    Hello doctor,

    I am 45 years old, I have just had surgery for a cataract and I have chosen a symfony toroidal implant. My vision from afar and intermediate is excellent and I have no Halo at the moment by against the close vision is a bit disappointing. I thought this implant had to correct it. Everything is blurred up to 65 cm, then everything is clear. What can it depend on? I had to pass 2 biometrics before the surgery and the results did not seem perfectly conclusive.

    Thank you and have a good day

  34. Dr. Damien Gatinel says:

    The symfony implant is designed to give intermediate vision and vision from afar, not from near vision. The implant behaves like a two-foci implant (far and intermediate), and is devoid of close focus. To achieve a clear vision at any distance without glasses, you have to opt for trifocal implants.

    More explanations (a little technical but in pictures) here: https://www.youtube.com/watch?v=pelonlHfEVs

  35. Pierrette says:

    Hello doctor
    First of all, thank you for your very interesting site.
    I'm 61 years old. I consulted an ophthalmologist in December 2018 to inquire about a possible possibility of not going through the wearing of my progressive glasses all the time while my eyesight required it more and more. The surgeon told me that I had a cataract start and that he could correct everything by putting on the trifocal toric implants (Zeiss).
    I was therefore operated on January 26th, 2018 of the left eye (good preparation and smooth running) and on February 1st of the right eye (not the same protocol of preparation with drops instillated much closer to the intervention and much more felt unpleasant during operation). I have a small white mark on the iris of the right eye, the surgeon told me that it was a small trauma of the Iris caused during the operation but that had no impact on my eyesight ("it will have to do with," he told me).
    To this day, a little more than 2 months later, I am still often in discomfort, with this sensation of almost permanent discomfort to the right eye. In the shops, the rooms... my eyesight is cloudy, it's unpleasant and very annoying.
    During my last post-operative visit of March 21st, the surgeon was not very sympathetic, unsympathetic to my remarks and almost guilty, telling me that he could not do anything for me and that for him it was a success. I got out of here depressed. My next appointment is June 20th, but I'm worried and upset. It's a long time.
    Do you think my eyesight can still improve? Can this IRIS mark be the cause of discomfort? Do you have any advice, any solutions?
    Thank you in advance kindly to pay attention to my testimony.
    Well to you.

  36. Dr. Damien Gatinel says:

    The mark on the IRIS is a small local depigmentation, and does not explain, a priori, your Visual discomfort. Surgery may have been more difficult, and you have to try to quantify the Visual disorder, determine the cause (astigmatism? retinal edema? a little bit off-center? etc.) Your surgeon should enlighten you on this point.

  37. Dominique says:

    Hello doctor,
    I am 52 years old and suffers from the onset of cataract and Fuchs endothelial dystrophy. I'm advised of the cataract surgery before the one for dystrophy. Can you advise me in the different bifocals or trifocal implants (or other) the brand of implants you advise me to completely remove the wearing of glasses (my current progressive glasses of memory correction of + 2 and addition of + 2) and to minimize the effects of light halos that some implants would induce for example when driving at night or facing an important light.
    In advance thank you for your reply.

  38. Dr. Damien Gatinel says:

    The installation of multifocal implants is not recommended case of the Fuchs dystrophy type of corneal anomaly. It all depends on the stage of this dystrophy and the risk of postoperative corneal edema...

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