What does mean when u see in black and white and u see in flashes?

Listen to your body: Such a visual disturbance can come from inadequate blood flow to the visual cortex of the brain. May need more fluids, if associated with change in position, try lying down or putting head between legs if sitting. It can be a vascular spasm before a migraine. Eat 6 healthy meals a day, avoiding processed foods, get a good night sleep, not too much melatotnin, move through the day and destress.