Charles Bonnet Syndrome: Seeing Things When Sight Is Failing
Older parents with failing eyesight can see vivid people or patterns that are not there, and the eyes are often the reason. This guide explains the pattern, how to respond calmly, and which new symptom needs a doctor the same day.
At a glance
- The condition: Charles Bonnet syndrome, where people with significant sight loss see images that are not real.
- What the images look like: Repeated patterns, grids or shapes, or detailed pictures of people, animals, furniture or streets.
- Do they know it is not real: Most people do, although the images can still be unsettling.
- Is it dementia: No. The images are linked to sight loss and are not a sign of a mental health problem.
- When it is urgent: New images with fever, sudden confusion, drowsiness or weakness need a same-day doctor check.
- Quotable line: The images start in the eyes, but a new symptom that arrives with them still needs a doctor.
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What is Charles Bonnet syndrome, in plain words?
Charles Bonnet syndrome is the name for seeing images when a lot of vision has been lost. The eyes stop sending the brain a full picture, and the brain can fill some of the gaps with pictures of its own. RNIB explains that the hallucinations are caused by sight loss and are not a sign of a mental health problem.
It is not the same as memory loss. Seeing the images does not, on its own, show that your parent’s thinking is failing. Other causes still get checked, but the eyes are the first place to look.
What do the images look like, and do they feel real?
The images are visual only. Some are simple repeated patterns such as grids, brickwork or shapes. Others are detailed pictures of people, animals or rooms.
Most people know the images are not real, even when they are vivid and disturbing. Episodes often become less frequent over time, although they may not stop completely. Because they may not stop completely, it helps to plan for them rather than wait for them to end.
How do you respond when your parent sees someone who is not there?
- Stay calm and do not argue. Telling your parent the image is not real usually upsets them more than the image does.
- Ask one open question. Try “What do you see, and does it bother you?” Then listen to the answer before you say anything about it.
- Change the setting if it bothers them. Turn on the room light, move to a chair they know well, or give them something to hold while the image passes.
- Write it down and bring it to the eye appointment. The log below gives the clinic the details it needs. Ask the clinic which information they prefer.
The sight and time log
For each episode, note the date, the time of day, how bright the room was, what the image showed, and how long it lasted. Keep the notes on the fridge or the family phone. The pattern often shows up in the log, such as images at dusk or in a dim hallway, and that is useful for the eye doctor.
When is a new symptom a reason to call the doctor the same day?
The usual pattern is steady. The images are recognised as unreal, and they come and go. A change is different, because a new symptom can mean the cause is something other than the eyes, and only a doctor can check that.
Call the doctor the same day if the images come with a fever, sudden confusion, unusual drowsiness, new weakness or a headache. Call your local emergency number straight away if sudden confusion comes with weakness, face drooping or trouble speaking, because a stroke needs urgent medical help. A sudden loss of sight in one eye also needs an urgent eye check. Print these signs and keep them where every carer can see them.
What helps at home between visits?
There is no known medical treatment that stops these images for everyone, and no home remedy is proven to stop them. The practical aim is comfort, safety and a proper eye check. A well-lit home at dusk helps, because a dark corner can make a real shadow look like a figure. The home eye tests article covers simple checks, but a test at home does not replace the clinic.
Keep the regular eye appointments, and ask whether the eye team can refer your parent to local low vision support. A calm routine in the evening, with the same light and the same seat, makes episodes easier to live with for both of you.
Could the eyes be the reason, or is something else going on?
Sight loss can come from several eye conditions, and the eye team checks which ones apply. A cataract is one example that the clinic checks for. Macular changes can also cause central vision loss, which is covered in the macular warning signs guide. Your parent’s eye team decides which tests are needed, so bring the log and any questions to that appointment.
If memory or day-to-day thinking is also changing, that needs its own assessment. Read the dementia signs guide for the difference, and the sudden confusion guide for the urgent pattern.
Your questions about seeing things with sight loss
What is Charles Bonnet syndrome?
It is seeing images, often people, animals, patterns or objects, while living with significant sight loss. The images are visual only, and most people know they are not real.
Is seeing things always dementia in elderly parents?
No. Charles Bonnet syndrome is linked to sight loss, and RNIB says it is not a sign of a mental health problem. If memory or thinking is also changing, that needs its own check by the doctor.
Are the images dangerous?
The images are not dangerous on their own, but they can frighten or upset someone and make walking feel less certain. New confusion, fever or weakness along with the images needs a same-day doctor check.
Should I argue with my parent about what they see?
No. Arguing usually upsets the person more than the image does. Ask what they see, check whether it bothers them, and stay with them until it passes.
Do the images go away?
Often they become less frequent, although they may not stop completely. Because they may not stop completely, a calm routine helps more than waiting for the images to end.
Is there a treatment for Charles Bonnet syndrome?
RNIB notes that there is currently no medical treatment for Charles Bonnet syndrome, but there are things that can help. The focus is on the underlying sight loss, comfort and safety. Check any suggested remedy with the doctor or pharmacist before trying it.
Does cataract cause these images?
Cataract can be part of the sight loss, so the eye check looks for treatable causes such as cataract. Whether a treatment changes the images depends on the case, so ask the eye clinic.
What tests will the doctor do?
RNIB advises a general health check to look for other factors that may be making the images worse, and an eye check is part of that process. The log of episodes helps the appointment.
Who can help the family at home?
Ask the eye clinic about local low vision support, and RNIB publishes information about Charles Bonnet syndrome, and the eye clinic can advise on local support. Your parent’s GP can also advise on support at home.
The quotable line for families is simple: the images start in the eyes, but a new symptom that comes with them is a reason to call the doctor. Use the Eye Care hub for more guides on looking after eyes at home.