Originally Posted by Jane-Busty.pl

Flashing lights? Well, no. It's about matching the sight with other impulses coming from human body. Like heart rate, blood pressure, adrenalin level, etc.
Each movement causes them. Unless you're not moving but your eyes provide a movement to your brain. CONFLICT. Then your brain takes it as possible poisoning.
Sight is not just seeing. There's a lot more to it. After you'll read one of those books, your doubts will vanish. :-)