A cataract operation involves removing the natural cloudy lens from the eye. Without a lens within it the eye is widely out of focus and remains legally blind. The best remedy for this is to insert an artificial lens into the eye. This is now a standard part of cataract surgery, though it has not always been so.
This artificial lens is called “The Intra Ocular Lens Implant”. Surgeons often refer to it as the IOL (Intra Ocular Lens). If a lens implant is not used the eye must be brought into focus with either a spectacle lens or contact lens. Each of these has disadvantages. A spectacle lens will be thick, heavy and restrict the field of vision. A contact lens has to be looked after and taken on and off the eye. An intra ocular lens once inserted can be forgotten about by the patient and restores the eye to the most nearly natural state.
The Lens Implant in India
This section provides more information about the Intra Ocular Lens Implant. It expands on the brief explanation given on the previous page. It includes information about:
- The history of intra ocular lens implants.
- Types of intra ocular lens implants .
- Intra ocular lens implant power.
- Innovations & possible future developments with intra ocular lens implants.
Premium IOLs: Multifocal & Accommodating in India
Traditional IOLs are monofocal, meaning they offer vision at one distance only (far, intermediate or near). They definitely are an improvement over the cataractous lens that is replaced during surgery, which provides only cloudy, blurred vision at any distance. But traditional IOLs mean that you must wear eyeglasses or contact lenses in order to read, use a computer or view objects at arm’s length.
The new multifocal and accommodating IOLs such as Crystalens offer the possibility of seeing well at more than one distance, without glasses or contacts. Examples of multifocal IOLs are different versions of Alcon’s AcrySof IQ ReSTOR. Abbott Medical Optics also offers the Tecnis and ReZoom multifocal lenses.
Presbyopia-correcting IOLs are considered “premium” lenses, which means that you must pay any associated extra cataract surgery costs yourself. Medicare and most health care plans will not cover these extra costs, because the additional benefits of these IOLs are considered a luxury and not a medical necessity.
Toric IOLs for Astigmatism in India
Toric IOLs designed to correct astigmatism also are considered “premium” lenses, and — like multifocal and accommodating IOLs — likely will cost you extra because of benefits that are unavailable in conventional IOLs.
The FDA also approved the AcrySof IQ Toric IOL (Alcon) in September 2005. Different models of this toric IOL can correct 1.50 to 3.00 D of astigmatism. This lens also is available in aspheric versions for crisper vision. Different models also can filter potentially damaging UV or blue light.
Most surgeons who treat astigmatism in their cataract patients tend to use astigmatic keratotomy (AK) or limbal relaxing incisions, which involve making incisions in the cornea.
But in addition to or even instead of corneal astigmatism, some people may have lenticular astigmatism, caused by irregularity in the shape of the natural lens inside the eye. This can be corrected with a toric IOL. Risks include poor vision due to the lens rotating out of position, with the possibility of further surgery to reposition or replace the IOL.
The Artisan/Veriseyes and ICL devices are phakic IOL (Intraocular Lens implant) Implants that are implanted inside the eye to correct your refractive error – effectively a maintenance free contact lens inside your eye.
The advantages of the implant are the following: Reversible Rapid visual rehabilitation Excellent quality of vision Ability to correct high levels of correction, both for nearsightedness and farsightedness Ability to correct high levels of astigmatism Long track record