Who has one eye among them in Greek mythology?

There were Cyclopes, monsters with one eye. During babyhood, they stand only 7 feet tall. If you're looking for Olympians, then Hephaestus, because he was born crippled and thrown off of the tower of Olympus by Hera, who only cares about her perfect family.

No, sorry, see the next answer!

Answer 2: The question is not 'one eye each' but 'one eye among them'.

This is true about the graeae who guarded Medusa's cave.