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  • Closeup of a mature or advanced cataract in an older adult's eye

    What Are Cataracts?

    Leer en Español:
    ¿Qué son las cataratas?
    By Kierstan Boyd
    Reviewed By J Kevin McKinney MD
    Edited By David Turbert
    Sep. 13, 2021

    A cataract is when your eye's natural lens becomes cloudy. Proteins in your lens break down and cause things to look blurry, hazy or less colorful.

    In this article:

    • Vision Problems with Cataracts
    • Symptoms of Cataracts
    • Causes of Cataracts
    • Diagnosing Cataracts
    • Treating Cataracts

    Inside our eyes, we have a natural lens. The lens bends (refracts) light rays that come into the eye to help us see. The lens should be clear, like the top lens in the illustration.

    Vision Problems with Cataracts

    If you have a cataract, your lens has become cloudy, like the bottom lens in the illustration. It is like looking through a foggy or dusty car windshield. Things look blurry, hazy or less colorful with a cataract.

    The definition of a cataract is a cloudy lens in the eye, whatever the cause may be. Here the cataract lens is compared to a natural clear lens.
    The top lens is a clear, natural lens. The bottom lens shows clouding by cataract.

    Video: What Are Cataracts?

    Cataracts Symptoms

    Here are some vision changes you may notice if you have a cataract:

    • Having blurry vision
    • Seeing double or a ghosted image out of the eye with cataract 
    • Being extra sensitive to light (especially with oncoming headlights at night)
    • Having trouble seeing well at night, or needing more light when you read
    • Seeing bright colors as faded or yellow instead

    If you notice any of these cataract symptoms, notify your ophthalmologist.

    Example of dull or yellowed vision from cataracts

    Cataracts can make images appear dull or yellow.

    Example of blurry or dim vision from cataracts

    Blurry or dim vision is a symptom of cataracts.

    Example of distorted or doubled vision from cataracts

    Cataracts can cause distortion or ghost images.

    See a simulation of what vision with cataract looks like.

    What Causes Cataracts?

    Aging is the most common cause. This is due to normal eye changes that begin to happen after age 40. That is when normal proteins in the lens start to break down. This is what causes the lens to get cloudy. People over age 60 usually start to have some clouding of their lenses. However, vision problems may not happen until years later.

    Other reasons you may get cataracts include:

    • having parents, brothers, sisters, or other family members who have cataracts
    • having certain medical problems, such as diabetes
    • smoking
    • having had an eye injury, eye surgery, or radiation treatments on your upper body
    • having spent a lot of time in the sun, especially without sunglasses that protect your eyes from damaging ultraviolet (UV) rays
    • using certain medications such as corticosteroids, which may cause early formation of cataracts.

    Most age-related cataracts develop gradually. Other cataracts can develop more quickly, such as those in younger people or those in people with diabetes. Doctors cannot predict how quickly a person’s cataract will develop.

    You may be able to slow down your development of cataracts.

    Protecting your eyes from sunlight is the best way to do this. Wear sunglasses that screen out the sun’s ultraviolet (UV) light rays. You may also wear regular eyeglasses that have a clear, anti-UV coating. Talk with your eye doctor to learn more.

    Cataract Diagnosis

    Your ophthalmologist will examine and test your eyes to make a cataract diagnosis. This comprehensive eye exam will include dilation. This means eye drops will widen your pupils.

    A patient having a slit-lamp exam
    Slit-lamp exam

    Slit-lamp exam

    Your ophthalmologist will examine your cornea, iris, lens and the other areas at the front of the eye. The special slit-lamp microscope makes it easier to spot abnormalities.

    Retinal exam

    When your eye is dilated, the pupils are wide open so the doctor can more clearly see the back of the eye. Using the slit lamp, an ophthalmoscope or both, the doctor looks for signs of cataract. Your ophthalmologist will also look for glaucoma, and examine the retina and optic nerve.

    Refraction and visual acuity test

    This test assesses the sharpness and clarity of your vision. Each eye is tested individually for the ability to see letters of varying sizes.

    Once I have a cataract diagnosis, what should I do?

    • Have an eye exam every year if you're older than 65, or every two years if younger.
    • Protect your eyes from UV light by wearing sunglasses that block at least 99 percent UV and a hat.
    • If you smoke, quit. Smoking is a key risk factor for cataracts.
    • Use brighter lights for reading and other activities. A magnifying glass may be useful, too.
    • Limit driving at night once night vision, halos or glare become problems.
    • Take care of any other health problems, especially diabetes.
    • Get the right eyeglasses or contact lenses to correct your vision.
    • When it becomes difficult to complete your regular activities, consider cataract surgery.
    • Make an informed decision about cataract surgery. Have a discussion with your ophthalmologist about:
      • the surgery,
      • preparation for and recovery after surgery,
      • benefits and possible complications of cataract surgery,
      • cataract surgery costs,
      • other questions you have.

    Cataract Treatment

    Cataracts can be removed only with surgery.

    If your cataract symptoms are not bothering you very much, you don’t have to remove a cataract. You might just need a new eyeglass prescription to help you see better. You should consider surgery when cataracts keep you from doing things you want or need to do.

    How does cataract surgery work?

    During cataract surgery, your eye surgeon will remove your eye’s cloudy natural lens. Then he or she will replace it with an artificial lens. This new lens is called an intraocular lens (or IOL). When you decide to have cataract surgery, your doctor will talk with you about IOLs and how they work.

    People who have had cataract surgery may have their vision become hazy again years later. This is usually because the eye’s capsule has become cloudy. The capsule is the part of your eye that holds the IOL in place. Your ophthalmologist can use a laser to open the cloudy capsule and restore clear vision. This is called a capsulotomy.

    Cataracts are a very common reason people lose vision, but they can be treated. You and your ophthalmologist should discuss your cataract symptoms. Together you can decide whether you are ready for cataract surgery.

    Next

    Cataract Surgery: Risks, Recovery, Costs

  • More Cataract Articles

    • What Is a Posterior Capsulotomy?
    • What Is Monovision (or Blended Vision)?
    • Adjustable IOL Could Help Some Ditch Their Glasses After Cataract Surgery
    • Can I Fly With This Eye?

    Popular Cataract Answers

    • Can cataract surgery affect depth perception? (Video Answer)
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    • How is the lens power determined before cataract surgery?
    • What are some of the risks associated with not having a cataract removed?
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    • Does marijuana help cataracts?
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