Here are examples of the word/phrase "eyeball" used in a sentence and paraphrased in a sentence...
A cyclops has only one eyeball but it is gigantic.
A cyclops has only one ocular ball but it is gigantic.
That creature's eyeball looks golden.
That creature's ocular ball looks golden.
When he evolved, a third eyeball appeared on his forehead.
When he evolved, a third ocular ball appeared on his forehead.
Other Examples...