the ball or globe of the eye.
eyeballs, Informal. people who view or read something: Old TV shows are getting a lot of eyeballs online.
verb (used with object)
Informal. to look at, check, or observe closely: two opponents eyeballing each other.
give (someone) the hairy eyeball, Slang. to look at (someone) with eyelids partly lowered, as in hostility or distrust.