I dont get any motion sickness at all, not on airplane, car, boat, etc. If I drink enough to get the spins, I will /not/ get sick when my eyes are open, even w

I dont get any motion sickness at all, not on airplane, car, boat, etc. If I drink enough to get the spins, I will /not/ get sick when my eyes are open, even when my eyes are clearly dealing with nystagmus.. but if I keep my eyes closed for more than 30 seconds, I definitely feel ill.