Why is an eyeball called and eyeball?

Question

Why is an eyeball called and eyeball?

Answer 1

Won't it be funny to call them eye pods?  Eye balls (human) are round & about the size of a squash ball. All eyeballs, human, animals & reptiles are round, most have round irises, except  for reptiles like lizards & snakes, they have vertical slitted irises.

Answer 2

cuz they're round.

Answer 3

cause its an eye and its shaped like a ball

Answer 4

Shakespeare used eyeball instead of simply eye in his play A Midsummer Night's Dream in order to fit the meter. Since then, it has become commonplace