The conclusion I come to is that there had to have been at least two saltations of modern humans on this planet, that is, the Cro Magnons who got here at some point before there was even light on the planet, and the familiar Bible antediluvians starting with Adam and Eve.
As far as the rest of it goes there would not be room in our minds if God would have told us every thing.
They had eyes because why, again?