Hello,
@mickyg1000, and yes, my mother (likely Alzheimer's, now later stage) has had a lot of vision and spatial and related issues with her dementia.
Earlier on this presented as problems with navigation and driving. I also noticed that she wasn't able at times to "see" things, and this would come and go. She lost the ability to "see" things on a mobile or computer screen, for instance, but could still see her television. She would also misinterpret what she was seeing (although some of that may have also been language issues; it can be hard to tell).
None of this was helped by her long standing vision problems, and now, her macular degeneration which is interfering with her sight.
The eye doctor and the neurologist both recommended improving the lighting in her room, which has helped somewhat. Some like the full spectrum light bulbs. Frankly, with my mother, it's often a struggle to get her to turn on the lights, or leave them on. You can only do so much!
Reducing glare and reflections and patterns may also help, as May considering contrast and color. Red seems to be a color that is more easily perceptible.
I'm sorry I haven't better advice and best wishes.