face of the earth. Hebrew "eye of the earth". Figure of speech Metonymy (of Effect), eye put for what is seen by it. App-6.
Related Commentaries of Exodus 10:5
Exodus 10:5
5 And they shall cover the facea of the earth, that one cannot be able to see the earth: and they shall eat the residue of that which is escaped, which remaineth unto you from the hail, and shall eat every tree which groweth for you out of the field: