Cicero (106-43 B.C.) is quoted as saying, "Ut imago est animi voltus sic indices oculi" (The face is a picture of the mind as the eyes are its interpreter).
And the bible, Matthew 6:23, reads "But if thine eye be evil, thy whole body shall be full of darkness. If therefore the light that is in thee be darkness, how great is that darkness!"
More and more I'm starting to believe there is something to this.