There was an online discussion I saw where the issue of people with dementia and their problems with vision was discussed. PWD often appear to struggle to see things clearly and, for example, may come to a halt if the colour of the floor changes. Although some people PWD are registered as blind, the problem is perhaps more often to do with the link between the eye and the brain. If this is not working too well the brain cannot properly interpret what the eye is seeing.
Particularly when they are tired or stressed, even people without dementia can temporarily misinterpret what they are seeing, though usually only for a very short period. I've noticed this effect more as I've got older. This is one more example of the many similarities between PWD and people without.
We're all just people, when you get right down to it.
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