The part about the reposetion of the silver eyes is probably refering to the practice of puting coins over the eyes of the dead in order to pay the ferryman to take them across the river styx. The fact that the ghost comes back may have something to due with the fact he couldnt cross the river into the land of the dead because he couldnt pay the ferryman, so his soul remains where he was buried, in the potter's field.
The part about the reposetion of the silver eyes is probably refering to the practice of puting coins over the eyes of the dead in order to pay the ferryman to take them across the river styx. The fact that the ghost comes back may have something to due with the fact he couldnt cross the river into the land of the dead because he couldnt pay the ferryman, so his soul remains where he was buried, in the potter's field.