How can you tell if he's flirting with his eyes?

You can tell if he's flirting with his eyes by looking you up and down.Or,always staring at you. omg..theres this fabulous guy that i like...and he was totally flirting with me cause he kept on lookin up and staring at me...while writing...than he was really sweet..but yeh..eyes are a language themselves..if ur heart says theres a connection then there probably is..