Frechy, its all about having a Dominant side. That works in conjunction with the Dominant Eye, youre either left or right sided. Which ever side your Peripheral eye is, is your dominant side.Which is your active side, the other side stabilizes it. Over a period of time, there becomes an imbalance in muscles adaptability on both sides. This causes usually a Hip inbalance, then all Hell is let loose. You lose your proprioceptive ability, and the thing that the body is there to carry, the Head, has to stabilize itself. Thats when the Sh=t hits the Fan in all direction. There are ways of stopping this.