Thursday, July 31, 2014

Intraocular Lenses

As we age, beginning around the age of 40, the natural lens inside the eye begins to harden and lose its flexibility. This reduces the eye’s ability to change its focus from near to intermediate, to distance, and back again. This is known as “loss of accommodation” or “presbyopia,” and its earliest symptom is difficulty seeing things up close. Bifocal and even trifocal glasses become necessary for some people to see clearly at all distances.
The recent innovations in intraocular lens (IOL) technology have been some of the most exciting advances in ophthalmology to date. Because of this we now have the ability to offer patients improved postoperative vision by greatly diminishing their spherical correction, astigmatism, cataract, and presbyopia, the level of satisfaction after surgery is at an all-time high.
At Cataract & Laser Eye Surgeons, we offer multifocal IOLs which provide the patient with multiple-focused vision at near, intermediate and far distances.
Select an IOL lens type below by clicking on it. Information for that lens will be displayed in the lens information area to the right.

Lens Types

Lens Information

Crystalens® is an accommodating intraocular lens that, unlike a standard IOL, can treat both a person’s cataracts and presbyopia- loss of near and intermediate vision. You probably noticed in your forties that you started to lose some of your up-close vision and had to start wearing reading glasses. Crystalens® not only treats your cataracts (a clouding or hardening of your lens), but can also reduce or eliminate your dependence on glasses and contacts. It does this by recreating accommodation similar to your eye’s natural lens. The unique lens can reduce or eliminate glasses for most activities including: reading a book, working on the computer and driving a car. Watch the Crystalens® video now.
Crystalens® was modeled after the human eye. Like the natural lens, it uses the eye muscle to flex and accommodate in order to focus on objects in the environment at all distances. Crystalens® dynamically adjusts to your visual needs because it's designed to allow the optic, or the central circular part of the lens that you see through, to move back and forth as you constantly change focus on images around you. Crystalens® flexes as you focus your vision.
Crystalens® Facts
  The first FDA-approved accommodating intraocular lens.
  The only IOL that provides a single focal point throughout a continuous range of vision.
  Significantly more patients implanted with a Crystalens® (88.4%) could see better at all distances then patients implanted with a standard IOL (35.9%).
  Most patients have continued to report excellent vision 7 years after implantation with Crystalens®. More than 95,000 Crystalens® implants have been performed worldwide, and that number is growing daily.
  Unlike other multifocal lenses, Crystalens® directs all available light received by the eye to a single focal point, comparable to that of a healthy natural lens.
  Crystalens® produces a single image consistent with normal vision, meaning patients do not need to neuroadapt to viewing multiple images. Patients also do not need to tolerate or adjust to high levels of halos and glare often associated with other multifocal IOLs.
Unlike conventional single-vision (monofocal) lens implants, state-of-the-art ReZoom® lenses have been specially designed with multifocal zones that provide good vision across the spectrum of varying distances and light conditions. So you can see well anywhere and anytime, be it near, far or in between. Patients no longer have to settle for monofocal lenses that only provide good distance vision with limited ability to see objects that are near without glasses.
The ReZoom® Multifocal Lens is a clear, foldable implant made of a high-refractive-index acrylic material. This new technology multifocal lens is designed to provide a full range of vision – near, distance and intermediate. The lens has multiple focal points so you can see well at a variety of distances in varying light conditions. If you have been diagnosed with cataracts with or without presbyopia and desire a full range of vision with increased independence from glasses or bifocals, the ReZoom® Multifocal Lens may be the right solution for you.
The ReZoom® Multifocal Lens features Balanced View Optics™ Technology – uniquely proportioned visual zones that provide it with a major advantage. Each ReZoom® Multifocal Lens is divided into 5 different zones with each zone designed for different light and focal distances. Unlike other earlier multifocal lens designs, the ReZoom® Multifocal Lens has proportioned the size of its zones to provide for good vision in a range of light conditions. For instance, some zones have been designed to offer greater low light/distance vision support during night driving.
Finally, the opportunity for freedom from reading glasses and bifocals. Until recently, life without reading glasses or bifocals wasn't an option for most cataract patients. You now have that option. The AcrySof ReSTOR® IOL is a unique technological innovation that can provide you with enhanced image quality and a full range of vision – near, far and everywhere in-between – for increased independence from reading glasses or bifocals! Watch the Acrysof ReSTOR® video now.
How does the AcrySof ReSTOR® IOL work?
As we perform daily activities such as reading, watching television or working at the computer, our eyes are constantly focusing on objects at varying distances – up close, far away and in-between. The ability to quickly change focus throughout our range of vision is called accommodation. Unfortunately, we begin to lose this ability as we grow older, gradually becoming more and more dependent on bifocals or reading glasses. Thankfully, by combining the strengths of apodized diffractive and refractive technologies, the AcrySof ReSTOR® IOL can now provide quality near, intermediate and distance vision, and increased independence from reading glasses or bifocals. And now, with the addition of proven aspheric technology, the AcrySof ReSTOR® IOL takes the advancements one step further, for a lens with enhanced image quality and clarity.
Apodized Diffractive Technology
Diffraction involves the spreading of light as it passes through a lens. You'll notice that, on the AcrySof ReSTOR® IOL, the center of the lens surface consists of a series of tiny rings – this is known as an apodized diffractive optic. Apodization is the gradual tapering of different diffractive levels (or "steps") on a lens, creating a smooth transition of light between distant, intermediate and near focal points. This means is that the series of tiny steps in the center of the AcrySof ReSTOR® IOL work together to focus light, providing excellent near, intermediate and distance vision.
Refractive Technology
Refraction involves the redirection of light as it passes through a lens. The outer ring of the AcrySof ReSTOR® IOL is a refractive region designed for excellent distance vision. This refractive area bends light as it passes through the lens, accurately focusing it on the retina for a crisp, clear image.
Aspheric Technology
Even healthy eyes still contain some imperfections, or "aberrations." Spherical aberration, a type of imperfection common to cataract patients, can eventually lead to a reduction in visual acuity and function. Thankfully, with the addition of a proven aspheric optic, the AcrySof ReSTOR® IOL can correct for these spherical aberrations, leading to enhanced clarity.
How You'll See
For most patients, the AcrySof ReSTOR® IOL delivers excellent near, intermediate and distance vision, potentially without the need for reading glasses or bifocals. In fact, with this increase in vision quality, patients would be able to pass the visual acuity portion of the driver's license exam in most states. The AcrySof ReSTOR® also delivers quality vision in a variety of lighting conditions. In brightly lit conditions, the central apodized diffractive portion of the lens sends light waves simultaneously to near, distant and intermediate focal points; in dimly lit conditions, the surrounding refractive area sends more light for distance vision. The AcrySof ReSTOR® IOL was designed with a unique aspheric optic that provides enhanced image quality compared to traditional spherical lenses. By correcting spherical aberrations that can develop on the lens with age, this lens offers high-resolution image quality.
What are your options for correcting astigmatism? If you depend upon eyeglasses, you may have experienced the inconvenience of not being able to find your glasses when you really need them. Eyeglasses are easily lost or damaged, expensive to replace, and inconvenient to clean and maintain. The more active you are, the more eyeglasses interfere with your lifestyle by complicating your participation in daily and recreational activities. Many people do not like the “look” of glasses and prefer another type of vision correction, such as contact lenses. “Toric” contact lenses designed to correct astigmatism are an option; however, some users find them uncomfortable and experience difficulty in adjusting to wearing them. There are several surgical options your surgeon may choose to treat astigmatism, such as laser vision correction, astigmatic keratotomy(AK), or limbal relaxing incisions (LRI). However, if you are planning to have surgery to remove a cataract, you now have an additional implantable lens that makes it possible to treat the cataract and correct the corneal astigmatism at the same time.
What is the AcrySof Toric® IOL?
The AcrySof Toric® lens is a foldable, single-piece lens that is implanted during cataract surgery to replace the clouded lens. The unique design of the AcrySof Toric® IOL makes it possible to reduce or eliminate corneal astigmatism and significantly improve uncorrected distance vision. AcrySof Toric® lens provides QUALITY distance vision, independent of eyeglasses and contact lenses. You may be able to break free from eyeglasses or contact lenses for distance vision in just one step, without the need for additional surgical procedures. The AcrySof Toric® lens is made of the same biocompatible lens material already successfully implanted in more than 25 million eyes since 1991.
New Technology Intraocular Lens (NTIOL)
New Technology Intraocular Lens (NTIOL) is a status given to lenses that provide patients with improved technology and new clinical benefits. As a member of the “Reduced Spherical Aberration” category established by CMS on February 27, 2006, Alcon’s AcrySof Toric® IOL recently received NTIOL status. The new AcrySof Toric® IOL is a perfect example of how technology continues to improve. It starts with a great base lens like the one-piece acrylic AcrySof IOL, add to that a blue light filter, then the ability to correct astigmatism, and now the ability to reduce aberration by adding the aspheric platform. The AcrySof Toric® IOL has been called a “technology plus” IOL. This means that it not only can be used to precisely correct the degraded image produced by an astigmatic cornea, but it can now further enhance image quality by duplicating many of the inherent qualities of the youthful crystalline lens with an aspheric design and the addition of negative spherical aberration. This newest generation of advanced technology IOLs now allows ophthalmic surgeons to simultaneously address multiple issues.
1. What is an intraocular Lens?
  An intraocular lens (IOL) is an implanted lens in the eye that replaces the existing lens. It usually consists of a small plastic lens with plastic side struts, called haptics, to hold the lens in place within the capsular bag inside the eye. IOLs were traditionally made of an inflexible material although this has largely been superseded by the use of flexible materials.
2. What is the difference between monofocal and multifocal IOLs?
  Most IOLs are monofocal. This means that they are designed to have only one clear point of focus (usually set at distance). As a result, patients usually have to use reading glasses to see near and intermediate objects after surgery. A multifocal or accommodating IOL is designed to mimic a natural lens and move within the eye allowing most patients to see at all distances without the need for glasses.
3. What are the differences between near, intermediate and distance vision?
  Near vision is defined as up-close vision or reading vision. Intermediate vision is vision at distances from 2 to 10 feet in distance and includes activities like computer work, reading the dashboard in your car and television viewing. Distance vision is looking at objects in the distance like traffic signals, watching sporting events and generally looking at any objects farther than 10 feet away.
4. Who is a candidate for a multifocal IOL?
  Anyone who has a normal eye exam and is dependent on reading glasses or bifocals may be a candidate. Although multifocal lenses were initially approved for cataract patients, it is not necessary to need cataract surgery to qualify for an IOL. Patients that are nearsighted, farsighted or those with Astigmatism are all potential candidates for lens replacement surgery. IOLs offer patients the option of correcting both distance and near vision problems with one procedure.
5. Will I still need to wear my glasses?
  Most patients who have a multifocal lens implanted are able to function at all distances including near vision without the need for glasses. However, some patients may still need the aid of reading glasses to read extremely small print or in dim light.
6. How long after surgery until I can see my best?
  Usually most patients will see clearly within a day after lens replacement surgery. This good vision will continue to improve during the next few weeks. Healing time, however, may vary from patient to patient.
7. Is there an adjustment period after surgery?
  Usually, there is not an adjustment period after surgery and good vision is attained fairly quickly. However, everyone’s eyes are different and healing times may vary from patient to patient.
8. Will the surgery hurt?
  Most patients will experience little to no operative or post-operative pain. Typically, topical anesthetic drops are placed in the eye and oral medications are administered to help patients relax.
9. What are the risks of this surgery?
  As with all surgical procedures, there are risks associated with lens replacement surgery. These risks need to be discussed thoroughly with your surgeon. Only you and your surgeon can make the decision that surgery is right for you.
Acrysof ReSTOR Video
Crystalens Video
Rquest Appointment

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