When he says his vision looks like colored sand does he mean it looks "grainy" as if he has lost fine resolution. Sort of like going from 720p to 240p on a youtube video?

Also does he note any "shimmering" of his vision when this happens? By this I mean something akin to objects seen through the hot air coming off a desert blacktop road.

And when he has his vision "jump" is it like he's looking through a zoom lense then it pops back to normal? This can go either way, that is from zoom-in back to normal or zoom-out back to normal.