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Cristalliniens implants monofocal and multifocal, o-rings

 Cristalliniens implants: General information

The lens implant or prosthesis of artificial lens is intended to replace the lens: it is placed after the withdrawal of the clouded lens (cataract surgery), in the capsular bag, in the 'back room' of the eye (located at the back of the iris). The materials used for the realization of these implants are flexible, with a shape memory allowing their injection through a small corneal incision (see:) cataract surgery in pictures). They are silicone-free and for the most part are derivatives of PMMA (polymethyl methacrylate), whose transparency, lightness and durability properties have been at the origin of his selection for the realization of the first artificial lens implants. Therefore, implants consist of acrylic materials hydrophilic or hydrophobic.

implant crystalline ultrasound high frequency

Evolution of pseudophakes implants

Intended to replace the natural lens, the implants called "pseudophakes". received significant innovations over the past five years. These improvements are the fruits of progress in machining and micro technology, biomaterials, and a more comprehensive approach the Visual needs of the cataract surgery.

The goal of surgery of the lens is thus limited to restore the ocular transparency, it also aims to optimize the quality and/or optical performance eye surgery.

Different ranges of implants are today proposed, possibly equipped with filters UV or blue light, etc... Some of these new implants have special properties to provide optical quality comparable to that of a young and transparent crystalline. The accuracy of the correction of Visual defects pre existing cataract as myopia, hyperopia, or astigmatism today increased thanks to advances in echobiometry (ocular biometry) and those of the interferometric measurement techniques of the "optical" axial length These techniques provide a preoperative estimation of the Dioptric power of the implant to be inserted for the refractive target. Provision of low and high power optical implant, or allowing the correction of astigmatism (implants-rings) to expand the range of the defective vision that it is possible to correct during the cataract surgery.

In practice, three types of strategies are mainly offered depending on the Visual and practical needs of the patient.

-The wish to get rid of glasses in vision from afar, even wear a correction for vision closely (or) joined the patient in a "monofocal" correction strategy

-On the other hand, the desire to escape eyeglasses both far and near statement of two approaches:

-fixed "multifocal": It is based on the insertion of multifocal implants (Diffractive bifocal,) Diffractive trifocals(, or refractive). The two eyes receive a multifocal implant.

-fixed by "monovision": It is based on the use of monofocal implant; an eye receives an implant intended for correction of far (usually the dominant eye), the other eye implant for the correction of nearly.

The choice between these different strategies depends on the wishes of the patient, as well as his eye condition (pathologies associated, etc.).

SEE: Implants-ringsMultifocal implantsMonofocal implant

19 responses to "monofocal, multifocal, and toric crystinian implants"

  1. […] Cristalliniens implants monofocal and multifocal, o-rings [...]

  2. […] Cristalliniens implants monofocal and multifocal, o-rings [...]

  3. Dr. Damien Gatinel says:

    Monovision is based on the use of monofocal implant: the dominant eye receives a monofocal implant allowing him to see from a distance without correction. The non-dominant eye receives a monofocal implant whose power is calculated for a vision almost without correction. Endothelial decompensation would be less of a potential problem with multifocal than monofocal implant.

  4. Marie-Christine Zminka says:

    Some eye drops are there against indicated ' are in case port of these implants?
    Ex = Ganfoet (Bimatoprost/timolol)
    Thank you for answering me.
    Kind regards

  5. Dr. Damien Gatinel says:

    No, for glaucoma treatment with multifocal implants are allowed. .. but the installation of these is rather discouraged in glaucoma case.

  6. Perennial Claude says:

    I am the victim of a decrease of brightness in the Middle under informed. A black spot, the night, just hide what I look at. Example: if I look at a starry sky I see peripheral stars but not the ones I watch.
    This black spot has no stable shape. The shape could recall a dog's head or a teapot. Currently it would be rather "Patatoïdale". Every year it seems to me that the stain is more dense in summer than in winter.
    I have reported this problem to the ophthalmologists consulted for an update of my corrections. I have not received any response. Not even an ' I do not know, I will look for... »
    Let me refer to a hypothesis which, of course, is not based on any particular medical knowledge:
    Would it be possible for the problem to come from implants posed to treat cataracts?
    Heterogeneity of silicone or other component? Mirror effect between 2 layers if different refractive index lenses no longer allow the regular transition of the light ray?
    Please tell me if this is a hypothesis worth exploring or a wishful thinking.

  7. Dr. Damien Gatinel says:

    To better clarify the origin of your symptoms, it should be clarified if this task is observed on an eye, or persists if both eyes are open. A loss located vision in the Visual field of one eye is known as the "scotoma". It may correspond to multiple causes, often original retinal or due to an anomaly at the level of the Visual ways. A review of the field of vision is so indicated. A priori, there is no direct connection with the implants. Furthermore, the fact do not or longer to distinguish a low direct fixation star is a normal phenomenon. Used for direct fixing photoreceptors are cones, and they are less sensitive at low intensities (like a little bright star) that sticks. There are no sticks on the fovea (direct attachment), and that's why the weakest stars are better seen fixing a point located at a slight distance from the Star (the received light stimulates then sticks).

  8. Christian Gaoussou says:

    What is the lifespan or efficacy of an artificial Crystalline lens? Thanks in advance

  9. Dr. Damien Gatinel says:

    The lifespan of an artificial Crystalline lens is "infinite", i.e. superior to that of the eye and the human being, for the classical and well-established materials (most of the polymers currently used for the creation of these implants by the companies Recognized in this area).

  10. David Monique says:

    I just had cataract surgery two days ago, the surgeon M posed a monofocal implant because I was operated from myopia by radial keratotomy in 1990, and my cornea is very damaged so it was not possible to put me multifocal implants but would have Could we consider monovisional implants? It seems that the CHIRURGIENM has put a power of 25.5 d What do you think?? I have to do the other Ouil next week.
    Thank you for your reply
    Mrs. Provost

  11. Dr. Damien Gatinel says:

    The monovision is an interesting option in your case. However, the accuracy of the prediction of the implant's potency is reduced to case antecedents of radial keratotomy. The monovision is obtained by aiming for an eye (the non-dominant) to be slightly myopic (the other being corrected for distant vision). There is no "absolute implant power" for this, it depends on the characteristics of your eye, these were measured during the realization of ocular biometrics.

  12. Clotilde Verguet says:

    I have to have cataract surgery, I also have a globular hyper pressure... Which implants are the most judicious, to meet my vision needs, namely to recover a good vision to drive, to work on computer, to read music scores. dzns a fairly reduced brightness.. on stage and at a distance of 80cm, 1M..
    What's more, these implants.. kind of magnifiers, are likely to lead to a DMLA, because of a faster burn of the cones?

  13. Dr. Damien Gatinel says:

    In your case , it seems interesting to propose implants that provide far-sighted vision and intermediate vision (music scores, computer). Trifocal implants (which also provide close-up vision), or extended-field implants (which in practice behave like multifocal implants with far vision and intermediate vision) respond to this. DMLA is not caused by implants, nor by the Crystalline lens natural, which also focuses the light on the retina!

  14. LUGASSY says:

    Hello doctor,
    I'm myopic and astigmatic. For 2 years, after a venous occlusion to the right eye, I receive an injection of Lucentis every 6 weeks. Soon, I have to benefit from a cataract intervention on this eye. My first wish would be to see the best possible from afar. However, being a musician, the ideal would be to be able to read also partitions located at 80/100 CMS. What type of implant would be most suitable? On the other hand, could you tell me the difference between an "Acrysoft TorIX" o-ring implant from Alcon and the "AT Lisa Roric 909M or MP" from Carl Zeiss?
    With all my thanks for your answers,

  15. Julie says:

    I have a diabetic retinopathy profiferante and congenital cataracre that I have to operate in April. I already Opere the left eye in July 2018 and I can read nothing more closely. My ophthalmo tells me that I can't benefit from an implant that would correct my eyesight. What is your opinion please?

  16. Dr. Damien Gatinel says:

    In case severe retinal affection such as Proliferative Diabetic Retinopathy, it is recommended to use monofocal (and toric) implants case corneal astigmatism), but no multifocal implant. If the power of the implant is chosen to correct your vision from afar (see NET from afar without glasses), then it will require a pair of corrective glasses for close vision. An alternative solution would be to aim for a slight myopic correction on the second eye (Monovision) intended to allow you to see closely this eye without glasses (monovosion).

  17. Dr. Damien Gatinel says:

    In this context, it is not necessary to opt for multifocal but monofocal implants (or toric if corneal astigmatism). The implant models that you report are precisely o-rings (for Alcon) and toroidal and mulutifocal (for the Zeiss).

  18. Daniel says:

    I read your article very interesting. I can ask you about my brother.
    I have my brother of 58 years old who has a myopia of-30 diopter he no longer supports his lenses
    irritation of the cornea dryness of the eye. Needless to say that without lens he sees nothing. He began to develop a cataract of the right eye; his retina is not bad – seen with his ophthalmo.
    What do you think the feasibility of operating the right eye of the cataract and putting an implant that would limit its myopia – be at least corrected as if it were seeing 2 to 3 tenth
    My brother has no morale he is looking for an ohpalmologist accustomed to these situations
    Kind regards
    L F

  19. Dr. Damien Gatinel says:

    It is certainly possible to see a cataract operation in order to reduce its nearsightedness and to clarify its vision. The power of the implant will be calculated, thanks to the biometrics examination, to reduce its myopia to about two or three diotpries.

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