It's completely cultural and essentially random. There's no reason that Americans would be unable to eat these things; it's just that historically, American cuisine (which is, sadly, full of processed food, fast food, and lots of oils, fillers and preservatives) stays away from foods that look like body parts or that have slimy textures. I'm sure that there are plenty of cultures that would not readily accept "foreign" cuisines because they simply aren't accustomed to them.
they used it as beads
no they did not eat the eyeballs
eyeballs are soft
they have 2 eyeballs.
No it's impossible to have hair on your eyeballs
buffalo eyeballs buffalo eyeballs
they are made from eyeballs...yeah! beat that!
Err - what is "up your eyeballs"
Yes. Chickens can move their eyes. It is not used the same as other creatures however. A chickens vision is better when the eyes remain still and they generally use head movements to focus. Turns and thrusts of the head will cause SACADIC movement of the eyeballs. It is a very slight movement. Avian anatomy shows that there are muscles attached and studies have been done.
No.
Possibly, some fish eyeballs may carry disease, but some may not.
Eyeballs are not actually perfectly round objects in an organism's body. Eyeballs are rounded objects that are shaped like ovals.