Your head is strapped to the goggles. So as you bounce around Tabby & your head stay together whilst the vehicle & the rest of your body move in a different direction.
I speak with experience. I have a set of Tabby Type E, still with it's MoS label. I have got them working, fitted them in the Rover, fitted IR filters on the headlights & went off roading by myself. I did about 100yds & that was enough!