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Generally what changes the intensity of VS for me is my blood pressure.

For example if I sit down for a long period of time and then suddenly stand up, the VS gets thicker and more intense for ~5-10 seconds before going back to normal intensity. This also might happen if I haven't eaten for a while and my blood sugar levels are very low.

-Light does play a part, thought it might just be that less light makes the VS more noticeable.

-Heavily patterned textures also make my VS "jump" around much faster. I hate walking down brick stairs since I often have problems distinguishing the edges of one step to another.

-Right after waking I might have some crazy visuals like geometric shapes popping back and forth for a second or two, but this doesn't often happen.

-And for some reason, if I hear a loud noise that I wasn't expecting to hear, my vision will often "flash" white for a split-second. I guess I have a few crossed wires in my brain ?