My guess is that he's right about the disturbing of the vestibular nerve and things "settling in" to where both sides play nice together. Also keep in mind that your head was in a weird position for an extended period of time during surgery, so likely your neck muscles are weak, sore, etc.. Those also play their role in vision. Your neck is what keeps your neck (and head) on an even state when you are in motion so that when you're moving, things looks more like you're not.. But, when your neck is sore, tight, etc.. then it's harder for your neck to perform that function hence making it harder to focus on moving objects. I remember my vision being great when I was still, but as soon as I started moving (or in a car, heaven forbid) then focusing on moving objects just made it look like the whole world was on acid...
I did ask my doctor at about 3 weeks when I could drink beer again.. His first response was asking if I was taking any medication (the pain pills they sent me home with). As long as I was off all medication, then he said a beer here or there was okay.. As long as you're off meds, then drink up!
Salut,
Brian