I have a question about balance problems from visual vertigo and how they might differ from other balance problems. I hope I have explained it clearly below!
As I understand it, for a sense of balance the brain usually uses inputs from (1) ear’s vestibular apparatus, (2) vision and (3) proprioception of where the body is in space. In the case of visual vertigo the brain relies more than usual on visual input and this often turns out to be because the ear’s vestibular apparatus is not working properly.
From this I can understand how in a supermarket, the vision keeps seeing a large shifting field of information and relying on that would affect balance.
**The strange thing is that I sometimes get a sensation of walking on sponges when I am at home where I can not coordinate at what level my foot should be put down when I take a step. Surely this is not exactly the same thing is visual vertigo? **
This is my thinking. Firstly, I figure if you are at home and you are only moving your head slowly and there is nothing moving quickly in your field of vision, then the effect of your visual vertigo on balance should be small. Secondly, I figure that if I lost my balance (due to something like visual vertigo) then I might suddenly need to correct it by sticking a foot in a different place but that sort of act of suddenly re-balancing myself is surely not the same thing as being unable to put my foot down properly. I hope you can understand what I mean.
Would I be wrong to think that the sense of walking on sponges is the result of a second dysfunction in addition to the problem of relying on vision for balance? As an example of what else it could be (although this is just a wild suggestion) if someone has problems of blood insufficiency to the posterior circulation of the brain then one of their symptoms would be that they feel as if they’re walking on sponges but they wouldn’t necessarily have visual vertigo.
I would be interested in any views on this as I am trying to collect my symptoms together in a letter to my neurologist and don’t want to start grouping together observations in a way which doesn’t help him.
Thank you for any info.