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Extended depth of focus intraocular lenses (IOLs) are for people with presbyopia. In some cases, they can help with cataracts and astigmatism.
These lenses can be implanted to alleviate the need for eyeglasses or contact lenses. They work well as an alternative to these eye correction devices for some people.
Once someone determines that these lenses are a good choice, they are implanted via a fairly simple surgical procedure. As part of the process, the doctor will discuss the brands and options that are available, so patients can make an informed decision.
What Are Extended Depth of Focus Intraocular Lenses?
Extended depth of focus IOLs were approved by the FDA in July 2016, so this is a very new technology. This lens works by compensating for a chromatic aberration of the cornea.
A chromatic aberration is characterized by the lens of the eye failing to focus on all the colors at the same point, according to research published in the Journal of Optical Society of America. When this aberration is present, people see fringes of color along the lines that separate the bright and dark elements of an image.
When someone is using these lenses, it enhances the sharpness of their vision at intermediate, far, and near distances. This eliminates chromatic aberration, so color boundaries are clearly distinguished.
Extended depth of focus intraocular lenses (IOLs) are for people with astigmatism, cataracts and presbyopia. In cataracts specifically, the cloudy lens is removed and replaced with an artificial IOL.
Who May Not Benefit From These Lenses?
Not everyone is a good candidate for these IOLs.
Presence of any of the following should be conveyed to the eye doctor, so they can determine if the person should have these lenses implanted:
- Fuchs’ dystrophy
- Advanced macular degeneration
- History of post-refractive surgeries
- Advanced dry eye
- Anterior basement membrane dystrophy
- Weak zonules
Extended Depth of Focus IOL Brands
TECNIS is the only brand that offers extended depth of focus IOLs. They offer the Symfony Extended Range of Vision IOL in the ZXR00 model. This is for correcting aphakia in adults. Aphakia is a term to describe the natural lens no longer being in the eye.
There are also the TECNIS Symfony Toric Extended Range of Vision IOLs. There are multiple models available, including the ZXT150, ZXT300, ZXT225, and ZXT375. These are used to astigmatism and aphakia.
Since this is such a new technology, the long-term potential remains unknown. Lens replacement for cataracts has long-term success, however, so the belief is that these lenses will be similarly beneficial.
The Surgical Procedure
The purpose of the surgery is to remove a person’s natural lens and replace it with an extended depth of focus IOL. The surgeon usually does each eye about a week apart, and each surgery takes approximately 15 minutes.
Before the surgery, the doctor will put drops into the eyes to anesthetize them, so the patient is comfortable. People are not put to sleep with general anesthesia for this procedure.
During the procedure, the doctor will start by removing the eye’s natural lens. Once this is successfully removed, the new IOL is put into place.
About a week after surgery, people can resume their normal activities. It may be several weeks before they get the final results from the lens replacement. Ultimately, the usual results are that people no longer need to wear contact lenses or glasses.
During the recovery period, it is not uncommon to experience halos, a scratchy sensation in the eye, blurry vision, and glare.
Make sure to follow all the recovery instructions exactly. Proper use of all medications and resting the eyes are recommended. These practices may decrease the risk of complications.
Possible Surgical Complications
The possible complications of surgery are very similar to those of cataract surgery since the procedures are essentially the same. These complications may include the following:
- Drooping eyelid
- Retinal detachment
- Artificial lens dislocation
- Vision loss
If someone has a serious medical condition or another eye disease, they are at a higher risk for experiencing complications. It is important to follow all of the preparation instructions before the surgery as these can reduce the risk of complications.
For example, the doctor might prescribe antibiotic eyedrops before the lens replacement. Using these reduces the risk of an infection during the recovery process.
People who have presbyopia might consider extended depth of focus intraocular lenses. They may help to improve vision without the need for contact lenses or eyeglasses. Talk to your doctor about what is best for your particular situation.
FDA Approves First Intraocular Lens with Extended Range of Vision for Cataract Patients. U.S. Food and Drug Administration.
Matching Color Images: The Effects of Axial Chromatic Aberration. Journal of the Optical Society of America.
Premium IOLs: How to Spot Poor Candidates. Review of Ophthalmology.
Refractive Lens Exchange (Lens Replacement Surgery). All About Vision.
Cataract Surgery. Mayo Clinic.
Astigmatism. American Optometric Association.
Facts About Presbyopia. National Eye Institute.
Presbyopia. All About Vision.
Facts About Cataracts. National Eye Institute.