My vision has been getting extremely blurred, almost blind feeling, and also feeling like I am cross eyed... it lasts about 30 seconds... if I cover one eye, I can see just fine, if I cover the other eye, I can see just fine, but when looking with both eyes it feels like my head is spinning and that I cant see temporarily.This started while I was on vacation in New York last week. It happened the first time as I was walking down some stairs, I had to stop because I couldnt see anything for about 30 seconds. I was riding a lot of busses, trains, subways, etc... where I'm usually not used to doing that much traveling in moving vehicles while standing and looking around... I live in Florida and just ride in a car.I thought it just had to do with all the motion and things like that... but now I have been home for 2 days and it is still happening. It seems to happen after I look down. I looked down at my keyboard and then when I looked up, I felt cross eyed and my vision was blurry, my eyes feel strained, hurting as if I were literally crossing my eyes intentionally. (keep in mind that if I look in the mirror, or at my husband, he says that my eyes are NOT appearing crossed at all... they look completely normal on the outside... it is the feeling I get that they are crossed.