IOL risks – Learn the risks associated with intraocular lens surgery

IOL intraocular lens implants in India

A cataract operation involves removing the natural lens of the eye clearly. Without a lens in the eye is largely developed and is blind. The best remedy for this is the insertion of an artificial lens in the eye. It is now an integral part of cataract surgery, if it so not always.

This artificial lens is called “The intraocular lens implant. surgeons often on the IOL (intraocular lens). If a lens implant is not used as the eye can be identified either with a glass of glasses or contact lenses. Each of these disadvantages. A lens is thick, heavy and narrow his field of vision. A contact lens should be supported and cared for and from the eye. An intraocular lens be forgotten once used by the patient and makes the eye to the next natural state.

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L’objectif Implant This section contains additional information on the intraocular lens implant, it extends the brief statement given to the previous page

It contains information on: – .

* The history of intraocular lens implants
* types. intraocular lens eyepiece.
intraocular lens implantation * power.
* innovation and possible future developments with intraocular lens eyepiece.

There were two particularly important factors in this: –

* First, the development of the gel-like substances (so-called viscoelastic) can be placed in the eye during surgery, to create space and protect the delicate internal structures of the eye. These substances allow the lens implant securely in place in the treated eye.
* The second factor is the development of surgical techniques, the preservation of a platform in the eyes or be positioned correctly in which a lens implant. The best location for an implant intraocular lens behind the pupil, as close as possible to the position of the natural lens of the eye waiver. for cataract surgery intra-capsular cataract extraction technique in the 1980s contributed to an implant behind the lens to support the pupil. phacoemulsification cataract surgery popular in the 1990s now means that the lens implant can be placed in the pocket (the so-called capsular bag) of the natural lens.

intraocular lens implants can be classified accordingly: –

* * including its />
rigid or foldable
find it in the eye is put to

Lens Implant designs

All intraocular lens made of two parts. The central component is the lens focusing or actual unit. It is the form of a thin round disc and is usually between 5 and 7 mm in diameter. This part of the lens is the “optical” called. to be extended from the edge of the optical members, called “haptic” support. This the objective situation in the eye and, ideally, hold the optical center of vision. Designs

Most lenses have two haptics extending from the optical in opposite directions there. There are some lenses on the market with more than two haptics. The goal as a whole from a piece of plastic can be produced. It is regarded as a target in one piece. Alternatively, the optical and haptic support prepared separately and then welded together. If the lens has two branches of haptic media in which in my perspective, it is considered a three-piece lens called ..

intraocular lens intraocular lenses are made of plastic material of clinical quality. These materials must be chemically stable and inert in the eyes. You should not cause irritation or damage caused by chemicals in the tissues of the eye. In other words, they must be safe and reliable. a life should be long

The first plastic are used to an intraocular lens Undo last Plexiglas (polymethylmethacrylate). aka PMMA. It is a rigid material and the same substance, made from the traditional hard contact lenses. Several million of these lenses were implanted. A company has a means of binding a substance to the surface of the lenses from this material called heparin developed. This has the effect that they stick “and ideal for use in the eye with a history of infection or in patients with diabetes ..

v rigid foldable lens implants

eye implants are made of PMMA (described above) is rigid. The “optical”, the focus of the lens is rigid. It can not be folded. This part of the lens is usually between 5 and 7 mm in diameter. The incision in the eye must be at least as large so that the lens can be placed in the eye. If the cut is made in the form of a slot as a tunnel, it can be self-sealing and requires no seams.

However, the bigger the cut, the more likely it is that the seam is required in order to leave the eye in a closed and secured at the end of the operation. News and silicone materials are acrylic foldable. The lenses can from those that can be folded to be made. This means that cataract procedures through a small incision over 3mms or may be less. The lens implant is folded and in the eyes, either with tweezers or a special injection device. Once in the eye of the lens is released and gently unfolds to its full size. It is then maneuvered into position ..

position within the eye

an intraocular lens can be placed in the space between the cornea and the iris, the iris attached to or behind the iris and pupil will be placed. Today, most eye implants placed behind the iris and pupil. The fluid-filled space between the cornea and the iris is called the anterior chamber. Eye implants designed to be placed here as anterior chamber intraocular lens eye (A / C IOL) is known.

These implants are made with S-shaped haptic (associate members), which remains in the periphery of the anterior chamber, where meet the root of the iris and the dome of the cornea. This is the chamber angle and this type of lens implant is “called load angle. When using an anterior chamber lens, it is generally necessary to make a small hole in the periphery of the iris. This is called a peripheral iridotomy (IP) ..

The intraocular lens implant power

The optical power or the power of the lens implant debate is measured in diopters (D). It is the same as for glasses and contact lenses used. The higher the number the stronger and more efficient is the focus of the lens. For a posterior chamber lens implant, using the usual style of implant today is the power of the lens implant, on average, about 22 D or 23 D

For short-sighted (myopic) eyes the power tends to be less than that, and for longer term (hyperopia) eyes, it is more expensive. The exact refractive index is chosen for each operation from the desired focus of the postoperative eye. Most lens implants are available in a set of standard force of 10 to 30 D D. This is the needs of most eyes. Powers outside this range are required for some models, the eyes that need occasional provided. innovations and possible future developments with intraocular lens implants

past and possible future developments in intraocular lens implantation design consists of: –

* Design Implant board
* Multifocal implants
* Adjusted implants * implants to correct the optical aberrations of the eye.
* adjustable implants.

Implant Design Edge

It was a lot in recent times, the best form for the edge of an area intraocular lens implant is later. The current consensus is that the rear edge of the lens (focus) of the lens must be rectangular and the front edge should be rounded. It is believed that the rear edge of space to prevent the development of posterior capsule opacity. is The implant target is on the posterior capsule.

based Immediately after surgery, because the structure of this membrane clear. In some eyes, as time passes, it will be cloudy or cloudy and deteriorating vision. This opacity is partly due to the proliferation of cells on the surface of the capsule. If the lens implant has a square rearward edge to the surface of the capsule which cell growth can prevent the capsule under the lens is applied. This would then help to keep the capsule in a clear line of sight. A rounded front edge is designed to reduce internal reflections and stray light in the eye. Many manufacturers have a lens implant to focus these advanced features adopted.

Multifocal Lens Implants />

Over the years, the natural lens is less flexible than every 60 years focusing is lost. Now, after a operation for cataract of the eye has a conventional fixed focal length. traditional lens implants have a unique ability can be focused not be resolved by the eye. If after a cataract operation the eye is the point, is needed for the near glasses for distance. In theory, a solution to this is to be used with a lens implant in both distance and near focus, but as bifocals ..

adjustment implants, as explained above in the section on multifocal implants after cataract surgery, the eye not classic opportunity to launch his own goals. The ultimate dream, or the Holy Grail of cataract surgery is to create a lens implant with an adjustable focus. If this were possible, then not only be restored from a cataract operation, but the eye also be returned to its freedom of youth reading glasses.

Some objectives have been designed that might be able to do so. If you are currently experimental and yet at the time of writing, their long-term success in clinical practice proved. The theory is trying for near vision focus on small muscle in the eye (called the ciliary muscle) causes the focus lens implant to move slightly. If the lens a little bit more forward in the eyes of his power is in fact increased slightly.

implants, the optical aberrations of the eye

The emphasis by a conventional lens implant is properly visually very simple. It is biconvex in general, namely the front and back are curved raised. This part of the surface curvature is a sphere, ie it is like bending a soccer ball. One goal of this design error the correct target eye. However, it is not correct the optical aberrations or other imperfections of the eye (eg spherical aberration).

These aberrations cause the vision of something broken down, especially if the pupil is large. The lens of the eye, so that some of these aberrations formed neutralized. In other words, is not a traditional style of the implant lens as good as a clear natural lens to the target as much as possible and to achieve clarity of vision ..

adjustable implants Another way to sharpen the focus of a lens implant to the individual needs of the eye adjust the length of the lens, having in mind that is to do after the operation was set produced. A lens material whose shape can be activated by ultraviolet light. A lens about the right size is and the eye is allowed to recover from the procedure. The focus and aberrations of the eye are then determined.

The objective is to be a specific wavelength of light, so that its form easily modified to the development of the eye exposed to improve. This can be done more than once if necessary. When the best focus was the aim is to different light sets with the error reached the target and hold the desired shape suspended.

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