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An intraocular lens, or IOL, is a small, clear, artificial lens that is placed inside the eye. It is used to replace the eye's natural lens after it has been removed during cataract surgery. The IOL's job is to focus light onto the retina, which allows you to see clearly.
read more about an intraocular lens (IOL) ...There are several types of IOLs, and the best one for you depends on your vision and lifestyle. The most common is a monofocal IOL, which is set for one distance, usually far away. Multifocal IOLs have zones that allow you to see at near, intermediate, and far distances, reducing the need for glasses. Toric IOLs are special lenses that correct astigmatism.
An IOL is put into the eye during cataract surgery. After the surgeon removes your eye's cloudy natural lens, the new, folded IOL is inserted through a very small incision. The IOL then unfolds into the proper position in the same place your natural lens used to be. The procedure is quick, and the incision is often so small it does not need stitches.
You and your eye surgeon will decide which IOL is the best fit. Your choice will depend on things like your lifestyle, any other eye conditions you have, and cost. For example, if you have astigmatism, a toric IOL might be recommended. If you want to be less dependent on reading glasses, you might consider a multifocal IOL. This important decision is made before your surgery.
Many modern IOLs are designed with a slight yellow tint to mimic the natural filtering properties of a healthy adult lens. This tint filters out high-energy blue light from the sun and digital screens. Some studies suggest this may help protect the retina, specifically the macula, from light-induced damage over time, although the primary goal is to provide comfortable, natural-looking color perception.
Even with the best IOL, you might experience cloudy vision months or years after surgery. This is not the cataract returning. It is a condition called Posterior Capsule Opacification, or a "secondary cataract." The membrane that holds the IOL can become foggy with scar tissue. Fortunately, this is easily fixed with a 5-minute, painless laser procedure (YAG capsulotomy) that creates a clear window in the membrane.
No. Once the IOL is in place and your eye has healed, you will not be able to see or feel it. It becomes a permanent part of your eye.
Yes, IOLs are made from a durable, biocompatible material and are designed to last for the rest of your life. They do not typically need to be replaced.
Yes. The IOL's power is custom-calculated for your eye. If you get a premium lens that corrects astigmatism or your need for reading glasses, you may end up with better vision than you have had in years.
You will discuss IOLs with your surgeon when you are planning for cataract surgery. This is the time to talk about your personal vision needs and goals. Make sure to ask questions about all the available options so you can make an informed choice about which lens is right for you.
1. IOL Implants: Lens Replacement After Cataracts. American Academy of Ophthalmology. https://www.aao.org/eye-health/diseases/cataracts-iol-implants. October 30, 2024.
2. Factors to Consider in Choosing an IOL for Cataract Surgery. American Academy of Ophthalmology. https://www.aao.org/eye-health/tips-prevention/best-artificial-lens-implant-iol-cataract-surgery. March 31, 2025.
3. Cataract Surgery. National Eye Institute. https://www.nei.nih.gov/eye-health-information/eye-conditions-and-diseases/cataracts/cataract-surgery. December 5, 2024.
4. Presbyopia-Correcting IOLs. American Academy of Ophthalmology. https://www.aao.org/eye-health/diseases/presbyopia-correcting-iols. January 14, 2026.
5. IOLs (Intraocular Lens): Pros and Cons. Cleveland Clinic. https://my.clevelandclinic.org/health/articles/25099-iols-intraocular-lenses. June 18, 2023.