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Cataracts: What They Are and What Symptoms to Watch For

Cataracts are a common, age-related clouding of the eye's lens that can make vision feel blurry, hazy, or less colorful. They develop slowly, often starting in your 60s or 70s, and can be mistaken for other vision problems or even dementia-related changes. The good news is that cataracts are treatable, and there are many practical steps you can take at home to help your loved one see more clearly and stay safe while you figure out next steps with their doctor.

Key points

  • Cataracts are a clouding of the eye's lens, common with aging, and treatable with surgery.
  • Symptoms include blurry vision, glare, faded colors, trouble seeing at night, and frequent prescription changes.
  • For someone with dementia, vision problems can worsen confusion and behavior, so always check vision first.
  • Improve home lighting with soft, indirect sources and use high-contrast colors to aid navigation.
  • Do not assume vision changes are just aging or dementia; get a dilated eye exam every two years after age 60.
  • Talk to the doctor about cataract surgery if it affects daily life; it is safe and can dramatically improve quality of life.

What Is a Cataract?

A cataract is a clouding of the normally clear lens inside the eye, kind of like looking through a foggy or frosted window. As we age, proteins in the lens can clump together, forming these cloudy areas that block or scatter light as it enters the eye. This makes images less sharp and can cause glare, especially at night or in bright light. Age is the biggest risk factor, but other things can cause cataracts too: diabetes, eye injuries (traumatic cataracts), certain medications like steroids, or even past eye surgery (secondary cataracts). Some people are born with them (congenital cataracts), but those are rare and usually small.

Why It Matters for Someone with Dementia or Memory Changes

For a person living with dementia or early cognitive changes, vision problems from cataracts can be especially confusing. When the brain is already struggling to process visual information, adding blurry or distorted input can make things worse. For example, glare from a window or overhead light can make a familiar room look strange, which might trigger anxiety, agitation, or even a false belief that something is moving or that someone is there. This is because the brain tries to make sense of the blurry image and may misinterpret it. In some cases, what looks like a sudden worsening of dementia could actually be an undiagnosed cataract making it harder for the person to see and understand their environment. That is why it is so important to check vision regularly, especially if you notice new confusion or changes in behavior.

Common Symptoms to Watch For

The most common early symptom is blurry or cloudy vision that feels like you are looking through a dirty window. Colors may seem faded or yellowed, and you might notice more trouble seeing at night, especially with headlights from oncoming cars causing glare or halos around lights. Some people also experience double vision in one eye or find that their glasses prescription changes frequently. Another telltale sign is that bright light becomes uncomfortable or even painful, making it hard to be outdoors or in rooms with lots of windows. For a caregiver, you might notice your loved one squinting more, holding reading material closer or farther away, or having trouble recognizing faces in dim light. They may also bump into furniture or misjudge steps because their depth perception is off. If you see any of these signs, it is worth bringing up with their eye doctor or primary care provider.

General caregiving information, not medical advice. Check medications and major care changes with your clinician.

Step-by-step

  1. Ensure regular eye exams at least annually, as cataract symptoms can mimic dementia-related vision changes.

  2. Maximize lighting in living spaces with bright, non-glare lamps to reduce shadows and improve visibility.

  3. Use high-contrast colors (e.g., dark plates on light tablecloths) to help distinguish objects.

  4. Reduce glare by using matte finishes on surfaces and positioning chairs away from direct window light.

  5. Limit night driving if glare from headlights causes halos or confusion, and use daytime driving instead.

  6. Keep a fixed place for frequently used items (e.g., glasses, remote) to avoid disorientation from poor vision.

What not to do

  • Do not assume vision complaints are solely due to dementia; rule out cataracts first.

  • Do not use high-gloss or reflective surfaces in high-traffic areas, as they worsen glare and falls risk.

  • Do not rearrange furniture or objects without warning, as reduced vision amplifies confusion.

  • Do not delay surgery if cataracts significantly impair daily function and safety.

Practical tools

  • High-Lumen Task Lamp

    A lamp with adjustable brightness (800+ lumens) and a shade to direct light downward, reducing eye strain and shadows.

  • Contrast-Enhancing Visual Aids

    Items like brightly colored tape on step edges, dark placemats on light tables, or large-print labels to boost object recognition.

  • Anti-Glare Eyewear or Clip-Ons

    Yellow-tinted or polarized lenses that cut glare from headlights and sunlight, improving daytime comfort and safety.

Discuss with your clinician

Ask the doctor: 'Could my loved one's recent confusion or agitation be related to an undiagnosed cataract?'

Ask the doctor: 'Is cataract surgery safe for someone with dementia, and what are the specific risks for their stage?'

Ask the doctor: 'Are there any medications my loved one is taking that could worsen cataracts or interact with eye drops?'

Ask the doctor: 'How often should we have their eyes checked, and should we see an ophthalmologist or optometrist?'

Ask the doctor: 'If they have a UTI, could that be causing sudden vision changes, and should we test for it?'

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