[bloppe]

Staring down is not equivalent to being blind. Motion sickness occurs when signals from your eyes (like the motion of the world around you), body (like wind on your face) and auricular semicircular canals (organs in your ear that sense acceleration) conflict with one another. In theory, your brain reacts to this with nausea because historically that situation would mainly arise due to illness or poisoning, so it might be good to vomit. That's why you can sometimes alleviate car sickness by opening a window (convincing your brain that you're definitely moving) or, if you're driving at constant speed, refraining from looking out the window (convincing your brain that you're stationary).

Blind people only have 2 out of the three signals so they might be less prone to motion sickness.