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Ask, Don't Assume: Adapting Care for Posterior Cortical Atrophy

Posterior cortical atrophy (PCA) is a rare dementia that attacks the back of the brain first, causing profound visual and spatial difficulties while memory and conversation often remain surprisingly strong. Standard dementia care—which assumes memory loss and confusion are the main challenges—can actually harm someone with PCA by assuming they can't understand or by pushing tasks that overwhelm their vision. This article gives you concrete, step-by-step ways to shift your approach: ask what the person sees and needs, never assume, and build a care routine that respects their intact thinking while adapting to their visual world.

Key points

  • PCA affects vision first, not memory. Always ask what the person sees before assuming they are confused or unable.
  • Standard dementia care that assumes memory loss can be harmful. Adapt your approach to the person's intact thinking and visual challenges.
  • Use high-contrast, clutter-free environments. Test colors and lighting with the person—what works for one may not work for another.
  • Describe obstacles and tasks in advance, using calm, specific language. Let the person set the pace.
  • Get a referral to a low-vision occupational therapist. This is a game-changer for practical daily living.
  • Join a PCA-specific support group. You are not alone, and others have found creative solutions you can adapt.

What is happening in the brain with PCA?

Posterior cortical atrophy is a progressive condition where brain cells in the back of the brain—the parietal and occipital lobes—shrink and die. These areas are critical for processing visual information, judging distances, recognizing objects, and understanding how things relate in space. Unlike typical Alzheimer's, which starts in memory centers, PCA spares memory and language early on. So a person with PCA may have a clear conversation, remember your name, and tell a detailed story, yet struggle to see the fork on the table or judge where the edge of the step is. This disconnect between 'looking fine' and 'struggling to see' is the core of why standard dementia care falls short.

Why 'ask, don't assume' is the golden rule for PCA

Because the person's thinking and communication are often intact, they can tell you what they see and what they need—if you ask. The trap is assuming they can't do something because they seem confused or slow. In PCA, slowness or hesitation is usually about vision, not cognition. For example, if they pause before reaching for a cup, it's not that they forgot what a cup is; it's that their brain can't tell them where the cup is in space. Asking 'Is the light too bright?' or 'Can you see the cup?' gives them a chance to say 'Yes, it's blurry' or 'I can't tell how far away it is.' This simple shift from 'I'll do it for you' to 'How can I help you do it?' preserves dignity and reduces frustration.

The visual symptoms are not eye problems—they are brain problems

A person with PCA may have perfect eyesight on an eye exam, yet still struggle to read, recognize faces, or navigate a room. This is because the brain cannot interpret what the eyes see. Common early signs include difficulty reading (words may seem to move or disappear), trouble judging distances (spilling drinks, missing the chair), and problems with complex visual scenes (like a cluttered table or a busy street). They may also have trouble with depth perception, so stairs become terrifying. Understanding this helps you avoid blaming the person or their eyes, and instead focus on changing the environment and your communication.

Standard dementia care can be harmful if applied blindly

Many dementia care approaches assume the person has memory loss and needs redirection, validation, or simple language. With PCA, these can backfire. For example, using a memory book or asking 'Do you remember?' can feel insulting because their memory is fine. Similarly, assuming they can't follow a conversation because they can't make eye contact or seem to stare is wrong—they may be trying to see you. The biggest danger is assuming they can't do something and taking over, which can lead to loss of independence, depression, and even falls if you move things without asking. The PCA-specific approach is to ask first, then adapt the task or environment, not the person.

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

Step-by-step

  1. Start every interaction by asking a simple visual question: 'What do you see right now?' or 'Is the light okay for you?' This opens the door for them to tell you if the room is too bright, if they can't see your face, or if the floor looks like a hole. Wait for their answer before moving on.

  2. When offering help with a task (like pouring a drink or walking to a chair), ask specifically: 'Would you like me to guide your hand to the cup?' or 'Do you want me to walk beside you and describe where the chair is?' Never grab or steer without asking—it can startle and disorient.

  3. Reduce visual clutter in key areas: clear the table of everything except what is needed, use solid-colored plates against a plain placemat, and remove patterned rugs or busy wallpaper. Ask the person: 'Does this room feel calmer to you now?' and adjust based on their feedback.

  4. Use high-contrast cues: put a bright red or yellow tape on the edge of steps, the rim of a white cup, or the handle of a door. Ask: 'Does this color help you see the edge better?' and change colors if needed—some people with PCA see certain colors better than others.

  5. When reading, try a simple reading guide: a piece of colored cardstock with a slit cut out to show one line at a time. Ask: 'Would you like me to hold this over the page, or do you want to try it yourself?' Let them control the pace.

  6. For eating, use a plate with a high rim or a 'scoop plate' and a weighted or built-up utensil. Place the plate in the same spot every meal. Ask: 'Would you like me to describe where the food is on your plate?' (e.g., 'The chicken is at 12 o'clock, the peas at 3 o'clock').

  7. When walking together, walk slightly ahead and describe obstacles in a calm, steady voice: 'We are coming to a step up in about three steps. The step is about six inches high.' Ask: 'Do you want me to count the steps for you?' and let them set the pace.

  8. Use a 'visual check-in' before any new activity: pause, make sure the person is seated or standing comfortably, and ask: 'Are you ready? Do you see what I see?' This gives them a moment to orient and reduces the chance of a fall or frustration.

  9. If the person seems overwhelmed or agitated, check the environment first: is the lighting too bright or too dim? Is there a flickering light? Is the room too noisy? Ask: 'Is something bothering your eyes or ears?' and address that before assuming they are upset about something else.

  10. Keep a small notebook or use a phone note to record what they say about their vision each day. For example, 'Today the kitchen light was too harsh' or 'The blue plate was easier to see than the white one.' Use this to fine-tune the environment and share with their neurologist.

What not to do

  • Do not assume they can't see you just because they don't make eye contact. Many people with PCA have difficulty with central vision or tracking faces. Instead, sit or stand directly in front of them at a comfortable distance, and say their name before speaking. Ask: 'Can you see my face now?'

  • Do not move furniture, rearrange the room, or change where things are kept without asking first. A person with PCA relies on spatial memory and consistency. A moved chair can become invisible to them. Always ask: 'I'm thinking of moving this table—would that help you or make things harder?'

  • Do not use memory aids or reminders about time unless the person asks for them. Their memory is often fine, and being reminded of the date or a past event can feel patronizing. Instead, ask: 'Is there anything you need to remember today that I can help with?'

  • Do not assume they are confused or 'out of it' because they are slow to respond. They may be processing a visual scene or trying to find you in their field of vision. Give them extra time, and ask: 'Take your time. Do you need me to repeat that?'

  • Do not try to 'fix' their vision by suggesting stronger glasses or eye exercises. The problem is in the brain, not the eyes. Instead, work with an occupational therapist who specializes in low vision or dementia to find practical adaptations. Ask your neurologist for a referral.

  • Do not talk about them in the third person as if they aren't there, even if they seem to be staring into space. They can likely hear and understand everything. Speak directly to them and include them in decisions. If you need to discuss something private, step out of the room and ask if that's okay.

Practical tools

  • The 'Ask First' Script

    A set of phrases to use daily: 'What do you see right now?' 'Is the light okay for you?' 'Do you want me to describe what's in front of us?' 'Would you like me to guide your hand?' 'Is there anything I can move to make this easier?' Keep these on a card or your phone. Practice them until they become automatic.

  • High-Contrast Visual Aids Kit

    Gather: brightly colored tape (red, yellow, or orange), solid-colored plates and cups (avoid patterns), a reading guide (cardstock with a slit), a high-contrast placemat (dark table with white mat, or vice versa), and a small flashlight for dim areas. Test each item with the person: 'Does this color help you see the edge?'

  • Daily Visual Check-In Log

    A simple notebook or note on your phone where you and the person together note: 'Today the kitchen light was too bright' or 'The blue plate was easier to see.' Review weekly to spot patterns. Share this log with their neurologist or occupational therapist to guide adjustments.

  • The 'One Thing at a Time' Rule

    When doing a task (eating, dressing, walking), remove all other visual distractions. Clear the table of everything except the plate. Turn off the TV. Close the blinds if the sun is glaring. Ask: 'Is there anything else in the room that is bothering your eyes?' before starting.

  • The 'Describe, Don't Direct' Technique

    Instead of saying 'Step up now,' say 'We are coming to a step up in about two steps. The step is about six inches high. I will count: one, two, step up.' Instead of 'Here is your fork,' say 'Your fork is on the right side of your plate, about three inches from the edge.' Ask: 'Do you want me to describe it again?'

  • Referral to a Low-Vision Occupational Therapist

    Ask your neurologist or primary care provider for a referral to an occupational therapist who specializes in low vision or dementia. This professional can assess the home, recommend specific tools (like special lighting, magnifiers, or tactile markers), and train both of you in adaptive techniques. This is not a one-time fix—it's an ongoing partnership.

Discuss with your clinician

Ask your neurologist: 'What is the likely underlying cause of my loved one's PCA—Alzheimer's, Lewy body, or something else? How does that change the prognosis and treatment approach?'

Ask about a referral to a low-vision specialist or occupational therapist who has experience with dementia. This is not a standard referral—you may need to request it specifically.

If the person is having visual hallucinations, ask: 'Could this be from the dementia, from medication, or from an eye problem? What is the safest way to manage them?'

Ask about clinical trials for PCA or atypical Alzheimer's. The UCSD and University of Colorado programs (mentioned in the videos) may have trials. Check clinicaltrials.gov or ask your neurologist.

If the person is on any medications that affect vision (like anticholinergics, some antidepressants, or glaucoma drops), ask: 'Could this medication be making their visual symptoms worse? Is there a safer alternative?'

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