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accommodation crystalline lens, correction presbyopia, accommodative lens for presbyopia, implant of accommodative lenses, correcting presbyopia, refractive defects, surgical intervention eye, surgical intervention presbyopia, presbyopia, eye diseases, visual defect, correcting presbyopia
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Presbyopia
| Presbyopia is not a real or proper visual defect, but a physiological process connected to age. After 40 years of age in fact, the normal eye (emmetropic) continues to see well from afar, but progressively loses the possibility to see near. |
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presbyopia
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| When an emmetropic eye looks from afar, the crystalline lens is relaxed and flat (Fig.1). In these conditions, the rays that pass through the cornea and crystalline lens, are deviated in such a way that the image arrives perfectly focused on the retina. If the eye were to move to look at a near object and the crystalline lens remains in the very same position, the rays would be conducted beyond the retina and the result would be a blurred vision of the object. |
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emmetropic eye vision
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| Accommodation is therefore the capacity of the crystalline lens to assume a suitable curve so that the images may be focused on the retina when looking “from near” (Fig.2). This capability occurs absolutely freely and involuntarily. As years pass (indicatively over 40) the accommodative capacity diminishes and as a result it is more difficult to focus the objects that are near (the most common difficulty is reading) (Fig.3-4-5). |
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accommodation crystalline lens
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| Presbyopia is corrected by placing positive lenses in the eye for far vision. (Fig.6) In cases of preexisting refractive defects, more types of corrections may be combined to give the patient better visual acuity for both far and near vision. For those already affected by myopia, presbyopia manifests itself just the same despite the false conviction that myopia and presbyopia compensate for each other. |
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correction presbyopia
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| For two years now, thanks to new methodologies and material, the problem of presbyopia can be resolved with high success percentages for many. In all the other cases in which the loss of accommodation is accompanied by the loss of transparency of the crystalline lens, it is necessary to replace it with an artificial one which we can introduce as a new accommodative lens that exploits the eye’s natural capacity to focalize and reacquire accommodation. |
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accommodative lens for presbyopia
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This accommodative lens is flattened through a very modern technique called the Phaco-laser, by which through a very small incision of 1.5 mm, a laser probe is introduced to emulsify and remove the opacified crystalline lens, and immediately replace it through the same incision, with an accommodative lens folded into two, but which unfolds in a natural way inside the eye, to then occupy exactly the same place as that of the old crystalline lens.
The surgical intervention is performed in the ambulatory, lasts about ten minutes after local anesthetics (eye drops), does not require hospitalization and heals rapidly. |
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accommodative lens for presbyopia
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| The use of accommodative lenses has certainly opened new frontiers and disproved the notion that presbyopia is impossible to correct. It is however opportune to say that the accommodative capacity of this accommodative lens may be influenced by numerous variables. The results of the implant of accommodative lenses in most cases will result in excellent medium and far vision and a remarkable improvement of near vision, without the aid of eyeglasses or any other lens. |
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implant of accommodative lenses
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| The accommodative lenses however cannot be introduced to all patients indiscriminately or by any kind of doctor. An experienced ophthalmologist, after having examined the patient with specific screening tests using specific instruments, will counsel the patient on the use of accommodative lens or on the many other possible alternatives. |
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screening tests for implant of accommodative lenses
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| Accommodative lenses are custom-built to fit each eye, since only total accuracy can produce the effect desired. The objective of correcting presbyopia is to restore natural vision as best as possible with this technique. With the introduction of this new accommodative lens, the patient’s vision is not only restored, but it goes back in time to what it was when the patient could perfectly see near and far without the use of eyeglasses. |
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correcting presbyopia
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Refractive Surgery
Dr. Appiotti performs surgery with the LASIK technique, and the PRK NIDEK EC-5000 and VISX S4 excimer lasers for the permanent correction of visual defects.
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