Hi there.

Welcome to the NeuroTalk Support Groups.

Not sure about the coloured sand part, but your post caught my eye regarding the vision jumps. Does your son have any other conditions like Epilepsy or Migraine, or anything else? Does he wear glasses? (edited to add: I've also heard of people with gluten sensitivity who have visual disturbances such as micropsia.)

You might like to search for "Micropsia".

I'd get a referral to a Neurologist if it was my boy.

Please let us know how he's doing.