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Cataract Treatment: Implanting a New Lens (IOL)

A cataract is a clouding of your eye’s lens. Surgery can be done to remove the cloudy lens and replace it with a plastic lens called an IOL (intraocular lens). The IOL can be placed either in front of or behind the colored part of your eye (the iris). Your eye doctor will choose the location that is best. This will depend on the condition of the capsule, the thin membrane that surrounds the lens. It will also depend on the type of IOL you will have. An IOL doesn’t change how your eye looks. But it can help you see better.



Posterior capsule lens

In most cases, an IOL is implanted behind your iris, in the posterior capsule. Flexible loops hold the IOL in place. The posterior capsule also provides support for the IOL.

Anterior capsule lens

If the capsule behind the lens is weak or damaged, your eye doctor will place a special lens in the anterior capsule. This is in front of your iris. Small loops hold the IOL in place.

Types of IOLs

Your eye doctor will select a new lens to fit your eye and vision needs. IOLs are made in slightly different shapes. In most cases, the IOL will last for the rest of your life. Talk to your doctor about which lenses are right for you. Some things to consider:

  • Special materials. IOLs are made of materials that won’t irritate your eye. These include silicone, acrylic, and a type of hard plastic called PMMA.

  • Foldable lenses. Many IOLs are foldable. This allows them to be inserted through small cuts (incisions) in the cornea or the white part of your eye (sclera).

  • Multifocal and accommodating lenses. These lenses use advanced technology to improve your range of vision, including up close. For best results, they are put into both eyes.


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